Celanese International Corporation v. Itc

Case: 22-1827   Document: 75    Page: 1    Filed: 08/12/2024




   United States Court of Appeals
       for the Federal Circuit
                 ______________________

   CELANESE INTERNATIONAL CORPORATION,
    CELANESE (MALTA) COMPANY 2 LIMITED,
         CELANESE SALES U.S. LTD.,
                 Appellants

                           v.

      INTERNATIONAL TRADE COMMISSION,
                  Appellee

 ANHUI JINHE INDUSTRIAL CO., LTD., JINHE USA
                      LLC,
                   Intervenors
             ______________________

                       2022-1827
                 ______________________

    Appeal from the United States International Trade
 Commission in Investigation No. 337-TA-1264.
                 ______________________

                Decided: August 12, 2024
                 ______________________

     DEANNE MAYNARD, Morrison & Foerster LLP, Wash-
 ington, DC, argued for appellants. Also represented by
 SETH W. LLOYD, BRIAN ROBERT MATSUI; AARON GABRIEL
 FOUNTAIN, Austin, TX.

    BENJAMIN S. RICHARDS, Office of the General Counsel,
 United States International Trade Commission,
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 2               CELANESE INTERNATIONAL CORPORATION v. ITC




 Washington, DC, argued for appellee. Also represented by
 DOMINIC L. BIANCHI, WAYNE W. HERRINGTON.

    NICOLE A. SAHARSKY, Mayer Brown, LLP, Washington,
 DC, argued for intervenors. Also represented by CLARK
 BAKEWELL, GARY HNATH, BRYAN NESE, MINH NGUYEN-
 DANG; SCOTT MCMURRY, New York, NY.

     BRIAN PANDYA, Duane Morris LLP, Washington, DC,
 for amicus curiae National Association of Manufacturers.
                  ______________________

  Before REYNA, MAYER, and CUNNINGHAM, Circuit Judges.
 REYNA, Circuit Judge.
     Celanese International Corporation, Celanese (Malta)
 Company 2 Limited, and Celanese Sales U.S. Ltd. appeal a
 decision of the United States International Trade Commis-
 sion. The International Trade Commission found Cela-
 nese’s asserted patent claims invalid under the on-sale bar,
 

35 U.S.C. § 102

(a), because Celanese sold products made
 using the patented process more than one year before the
 effective filing dates of the asserted patents. We affirm.
                         BACKGROUND
     Celanese International Corporation, Celanese (Malta)
 Company 2 Limited, and Celanese Sales U.S. Ltd. (collec-
 tively, “Celanese”) filed a petition before the United States
 International Trade Commission (the “Commission”), al-
 leging that Anhui Jinhe Industrial Co., Ltd., Jinhe USA
 LLC (collectively, “Jinhe”) and other entities violated 

19 U.S.C. § 337

. See In the Matter of Certain High-Potency
 Sweeteners, Processes for Making Same, & Prod. Contain-
 ing Same, Inv. No. 337-TA-1264, Order No. 29,
 

2022 WL 142328

, at *1 (Jan. 11, 2022) (“ITC Decision”);
 J.A. 53. Celanese alleged that Jinhe and other entities
 were importing Ace-K (an artificial sweetener) made using
 a process that infringed Celanese’s patents. J.A. 63.
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 CELANESE INTERNATIONAL CORPORATION v. ITC                     3



 Relevant to this appeal, Celanese asserted claims 11 and
 27 of 

U.S. Patent No. 10,023,546,

 claims 7, 28, and 33 of
 

U.S. Patent No. 10,208,004,

 and claims 1, 19, and 34 of 

U.S. Patent No. 10,590,095

. 1 ITC Decision, 

2022 WL 142328

, at
 *1, *4. The asserted patents each have an effective filing
 date of September 21, 2016, and are thus governed by the
 America Invents Act (“AIA”). 

Id. at *1

.
     It is undisputed that Celanese’s patented process was
 in secret use in Europe before the critical date of Septem-
 ber 21, 2015, i.e., one year before the effective filing date of
 the asserted patents. 

Id. at *3

. It is also undisputed that
 Celanese had sold Ace-K made using the patented process
 in the United States before the critical date. 

Id.

     Jinhe moved for a summary determination of no viola-
 tion of 

19 U.S.C. § 337

 on the ground that the claims at
 issue were invalid under the on-sale bar provision, 

35 U.S.C. § 102

(a)(1). According to Jinhe, because Celanese
 sold Ace-K more than one year before it applied for the as-
 serted patents, those sales triggered the on-sale bar. Cela-
 nese did not dispute that under pre-AIA precedent, sales of
 products made using a secret process triggered the on-sale
 bar, precluding the patentability of that process. See ITC
 Decision, 

2022 WL 142328

, at *3–4. Rather, Celanese ar-
 gued that the AIA changed pre-AIA law such that its
 pre-2015 sales of Ace-K made using its secret process would
 not trigger the on-sale bar. See 

id. at *3

.
     The presiding Administrative Law Judge (“ALJ”) re-
 jected Celanese’s argument, concluding that Celanese’s
 prior sales triggered the on-sale bar and that the AIA did
 not overturn settled pre-AIA precedent. In arriving at that
 conclusion, the ALJ found the Supreme Court’s decision in
 Helsinn instructive. 

Id.

 (citing Helsinn Healthcare S.A. v.



     1    Celanese also asserted several other claims, the va-
 lidity of which is not at issue in this appeal.
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 4              CELANESE INTERNATIONAL CORPORATION v. ITC




 Teva Pharms. USA, Inc., 

586 U.S. 123

 (2019)). Under
 well-settled pre-AIA precedent, the ALJ explained, a pa-
 tentee’s sale of products made using a secret process, as
 here, would trigger the on-sale bar to patentability. Id.
 at *3 (collecting relevant pre-AIA precedent). In Helsinn,
 the ALJ continued, the Supreme Court addressed whether
 Congress altered the on-sale bar when it enacted the AIA.
 See id. at *5. The Supreme Court held that Congress did
 not. Rather, as the ALJ noted, the Helsinn Court con-
 cluded that “when Congress reenacted the same language
 in the AIA, it adopted the earlier judicial construction of
 that phrase.” Id. (quoting Helsinn, 

586 U.S. at 131

). The
 ALJ found the Court’s reasoning applied equally to the
 facts here and supported that the AIA did not overturn
 long-established judicial precedent as applied to the facts
 here. 

Id.

      The ALJ considered Celanese’s contrary arguments
 and found them unpersuasive. Celanese relied on the
 AIA’s textual changes, primarily Section 102’s substitution
 of “claimed invention” for the pre-AIA reference of “inven-
 tion.” Id. at *6. This change, Celanese argued, meant that
 the AIA on-sale bar could only be triggered by sales of the
 claimed process itself, not by sales of products made using
 the claimed process. Id. The ALJ found Celanese’s posi-
 tion lacked merit. Id. Pre-AIA precedent, the ALJ ex-
 plained, recognized the distinction between a process and
 a product of a claimed process. Id. That precedent estab-
 lished that “a product could embody commercialization of a
 method invention sufficiently to trigger the on-sale bar.”
 Id. Following the reasoning in Helsinn, the ALJ concluded
 that the addition of the word “claimed” was insufficient to
 show the AIA overturned settled law as applied here. Id.
     The ALJ also rejected Celanese’s argument on the
 AIA’s removal of pre-AIA Section 102(g) and the expansion
 of prior-user rights under Section 273. Id. at *6–7. The
 ALJ reasoned that these changes were driven by distinct
 policy rationales, and those sections addressed issues
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 CELANESE INTERNATIONAL CORPORATION v. ITC                   5



 unrelated to patentees’ actions or the on-sale bar. Id.
 Lastly, the ALJ rejected Celanese’s argument on legislative
 history. Id. at *7–8. Evaluated in context, the ALJ rea-
 soned, the passages cited by Celanese did not show that
 Congress “thr[ew] out the [existing] understanding of the
 on-sale bar . . . , even if a few senators wished it were oth-
 erwise.” Id. at *8.
     The ALJ concluded that the AIA did not alter the
 pre-AIA rule that “a patentee’s sale of an unpatented prod-
 uct made according to a secret method triggers the on-sale
 bar to patentability.” Id. at *9. Accordingly, the ALJ held
 that Celanese’s claims at issue were invalid because Cela-
 nese sold Ace-K made using its secret process more than
 one year before it sought the asserted patents. Id. On that
 basis, the ALJ granted Jinhe’s motion for a summary de-
 termination of no violation of 

19 U.S.C. § 337

.
     Celanese petitioned for review of the ALJ’s decision by
 the Commission, which the Commission denied. See In the
 Matter of Certain High-Potency Sweeteners, Processes for
 Making Same, & Prod. Containing Same, Inv. No. 337-TA-
 1264, 

2022 WL 1043922

, at *1 (Apr. 1, 2022). The ALJ’s
 decision thus became the final decision of the Commission.
    Celanese appeals.      We have jurisdiction under 

28 U.S.C. § 1295

(a)(6).
                         DISCUSSION
      “Application of the on-sale bar under 

35 U.S.C. § 102

 is
 ultimately a question of law that we review de novo.” Hel-
 sinn Healthcare S.A. v. Teva Pharms. USA, Inc. (“Helsinn
 I”), 

855 F.3d 1356, 1363

 (Fed. Cir. 2017), aff’d, 

586 U.S. 123

 (2019).
     The question before this court is whether the AIA
 changed Section 102’s on-sale bar such that Celanese’s
 pre-2015 sales of Ace-K made using a secret process would
 not invalidate its later-sought claims on that process. Con-
 sistent with the Supreme Court’s holding in Helsinn, we
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 6               CELANESE INTERNATIONAL CORPORATION v. ITC




 agree with the Commission that the AIA did not effect such
 a change.
                               I.
      Congress first codified the on-sale bar in the Patent Act
 of 1836. See Patent Act of 1836, ch. 357, § 6, 

5 Stat. 117

,
 119. Since then, every patent statute has retained the
 on-sale bar as a condition of patentability. Helsinn, 

586 U.S. at 129

; Medicines Co. v. Hospira, Inc., 

827 F.3d 1363

,
 1371–73 (Fed. Cir. 2016) (en banc) (reviewing historical de-
 velopment of the on-sale bar). Before the AIA, Sec-
 tion 102(b) of the predecessor statute barred one from
 patenting an invention that was “in public use or on sale in
 this country, more than one year prior to the date of the
 application for patent.” 

35 U.S.C. § 102

(b) (2006) (empha-
 sis added); see also 

id.

 § 102(b) (1952).
     Interpreting the pre-AIA “on sale” provision, this court
 has long held that sales of products made using a secret
 process before the critical date would bar the patentability
 of that process. In D.L. Auld, a case we decided four dec-
 ades ago, we addressed facts strikingly similar to what we
 have here. D.L. Auld Co. v. Chroma Graphics Corp., 

714 F.2d 1144, 1147

 (Fed. Cir. 1983). D.L. Auld involved Auld’s
 patent drawn to a method of making cast decorative em-
 blems. 

Id.

 at 1145–46. More than one year before Auld
 applied for the patent, Auld used that method to make
 sample emblems and offered them for sale, while keeping
 the method secret. 

Id. at 1147

. We found Auld’s patent
 invalid. 

Id.

 We explained that the intent behind the on-
 sale bar is to preclude an inventor’s attempt to profit from
 commercial exploitation of his invention for more than one
 year before seeking a patent. 

Id.

 (citing Metallizing Eng’g
 Co. v. Kenyon Bearing & Auto Parts Co., 

153 F.2d 516

 (2nd
 Cir. 1946)). Because Auld offered for sale emblems made
 using its method and attempted to profit from such use be-
 fore the critical date, Auld forfeited “any right to the grant
 of a valid patent on the method.” 

Id.

 We have reiterated
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 CELANESE INTERNATIONAL CORPORATION v. ITC                   7



 the same holding in other decisions. See, e.g., Medicines,
 

827 F.3d at 1376

; In re Kollar, 

286 F.3d 1326, 1333

 (Fed.
 Cir. 2002); In re Caveney, 

761 F.2d 671, 675

 (Fed. Cir.
 1985); W.L. Gore & Assocs., Inc. v. Garlock, Inc., 

721 F.2d 1540, 1550

 (Fed. Cir. 1983).
      Our holding is consistent with Supreme Court prece-
 dent going back to the 1800s. In Pennock, a seminal deci-
 sion from 1829, the Supreme Court addressed the situation
 where an inventor sold products made using a patented
 process while withholding details of his invention from the
 public. Pennock v. Dialogue, 

27 U.S. 1

, 19–24 (1829). The
 Court reasoned that allowing the inventor to expand his
 exclusive rights by patenting the same invention would
 “materially retard the progress of science and the useful
 arts[] and give a premium to those who should be least
 prompt to communicate their discoveries.” 

Id. at 19

. In
 Metallizing, a 1946 Second Circuit case addressing the
 on-sale bar, Judge Learned Hand aptly observed that an
 inventor “shall not exploit his discovery competitively after
 it is ready for patenting; he must content himself with ei-
 ther secrecy, or legal monopoly.” Metallizing, 

153 F.2d at 520

. More recently, in Pfaff, the Supreme Court reiter-
 ated the same. Pfaff v. Wells Elecs., Inc., 

525 U.S. 55, 68

 (1998) (quoting Metallizing, 

153 F.2d at 520

). As a “limit-
 ing provision” on patentability, the on-sale bar prevents
 one from extending a patent monopoly beyond the statu-
 tory term by commercially exploiting an invention prior to
 seeking a patent. Id. at 64, 67. An inventor’s “voluntary
 act” of exploiting his invention through a commercial sale
 before the critical date constitutes “an abandonment of his
 right” to a patent. Id. at 64 (quoting Pennock, 

27 U.S. at 24

); see also Helsinn, 

586 U.S. at 129

 (first citing Pfaff,
 

153 F.2d at 64

; and then citing Pennock, 

27 U.S. at 19

). The
 same rationale reverberates throughout the history of our
 patent statute, and it holds true today.
     As shown above, under long-settled pre-AIA precedent,
 pre-critical date sales of products made using a secret
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 8               CELANESE INTERNATIONAL CORPORATION v. ITC




 process would trigger the on-sale bar to patentability and
 render invalid later-sought patent claims on that process.
 Under that precedent, Celanese’s prior sales of Ace-K made
 using its secret process, well before the critical date, would
 have triggered the on-sale bar and invalidated its later-
 sought patent claims on that process.
                              II.
                              A.
      In 2011, Congress enacted the AIA, shifting the
 “first-to-invent” system to a “first-inventor-to-file” regime.
 Pub. L. No. 112–29, § 3, 

125 Stat. 284

, 285–94 (2011); Mad-
 stad Eng’g, Inc. v. U.S. Pat. & Trademark Off., 

756 F.3d 1366, 1368

 (Fed. Cir. 2014). In enacting the AIA, Congress
 amended Section 102, the pertinent part of which now pro-
 vides that one shall not be entitled to a patent if “the
 claimed invention was patented, described in a printed
 publication, or in public use, on sale, or otherwise available
 to the public before the effective filing date of the claimed
 invention.” 

35 U.S.C. § 102

(a)(1) (emphasis added). 2
     In Helsinn, both this court and the Supreme Court had
 the occasion to address the reenactment of the “on sale” bar
 in the AIA. Helsinn involved a patent claiming palono-
 setron at a particular dosage, which is used to treat chem-
 otherapy-induced nausea and vomiting. Helsinn I, 

855 F.3d at 1361

. Before the critical date, Helsinn contracted
 to commercially supply the drug at the claimed dosage but


     2    Congress also retained the one-year grace period
 for certain disclosures made one year or less prior to apply-
 ing for patent, which was previously codified in pre-AIA
 Section 102(b) and is now codified in AIA Section 102(b)(1).
 As discussed infra, it is undisputed here that Celanese’s
 prior sales occurred before the critical date and as such, are
 outside of the one-year grace period. See, e.g., 

ITC Decision at *9

.
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 CELANESE INTERNATIONAL CORPORATION v. ITC                  9



 asked its marketing partner to keep the dosage confiden-
 tial. 

Id. at 1362, 1364

. The contracted sale, under well-
 settled pre-AIA on-sale bar precedent, would invalidate the
 patent. See 

id. at 1367

. Helsinn, however, contended that
 the AIA overturned pre-AIA law. 

Id.

 We rejected that con-
 tention.
     The Supreme Court affirmed. The Court explained
 that Congress reenacted the “on sale” language “against
 the backdrop of a substantial body of law interpreting
 § 102’s on-sale bar.” Helsinn, 

586 U.S. at 130

. This “sub-
 stantial body of law” encompasses the Federal Circuit’s ju-
 dicial interpretation of the term. 

Id.

 at 130–31. As the
 Court recognized, the Federal Circuit has long held that, to
 trigger the on-sale bar, a sale need not disclose the details
 of the invention to the public. 

Id.

 (first citing Special De-
 vices, Inc. v. OEA, Inc., 

270 F.3d 1353, 1357

 (Fed. Cir.
 2001); and then citing Woodland Tr. v. Flowertree Nursery,
 Inc., 

148 F.3d 1368, 1370

 (Fed. Cir. 1998)); see id. at 131
 (The Federal Circuit has “made explicit what was implicit
 in [Supreme Court] precedents.”). In view of well-settled
 pre-AIA precedent, the Court “presume[d] that when Con-
 gress reenacted the same language in the AIA, it adopted
 the earlier judicial construction of that phrase.” Id. The
 Court reviewed Helsinn’s cited textual changes, statutory
 structure, and legislative history, and found they failed to
 show Congress intended to upset that substantial body of
 long-settled precedent. See id. at 132; see also Helsinn I,
 855 F.3d at 1367–71.
     The same reasoning guides our inquiry here. As dis-
 cussed in the preceding section, under long-settled pre-AIA
 precedent, the on-sale bar applies when a patentee sells,
 before the critical date, products made using a secret pro-
 cess. We presume that when Congress reenacted the “on
 sale” language, Congress was aware of pre-AIA precedent
 and adopted the settled judicial interpretation of the term.
 Helsinn, 

586 U.S. at 131

. This presumption is appropriate
 where, as here, Congress reenacts statutory language that
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 10              CELANESE INTERNATIONAL CORPORATION v. ITC




 has attained settled judicial interpretation at the time of
 reenactment. Id.; see also Keene Corp. v. United States, 

508 U.S. 200, 212

 (1993). In interpreting the reenacted lan-
 guage, we generally adhere to that settled judicial inter-
 pretation unless Congress showed an intention to alter it.
 See, e.g., Cent. Bank of Denver, N.A. v. First Interstate Bank
 of Denver, N.A., 

511 U.S. 164, 185

 (1994) (citations omit-
 ted); Molzof v. United States, 

502 U.S. 301, 307

 (1992)
 (quoting Morissette v. United States, 

342 U.S. 246, 263

 (1952)). With this in mind, we next turn to whether, in
 reenacting the term “on sale,” Congress intended to abro-
 gate the settled construction of the term relevant here.
                               B.
     Celanese contends that, in enacting the AIA, Congress
 intended to alter the on-sale bar such that its pre-2015
 sales of Ace-K would not invalidate its later-sought patent
 claims. To support its contention, Celanese points us to
 certain textual changes in Section 102, other AIA sections,
 and selected excerpts from the legislative history.
                                i.
     Celanese cites several textual changes in AIA Sec-
 tion 102(a) and argues that they indicate congressional in-
 tent to alter the on-sale bar. Celanese directs us to AIA
 Section 102(a)’s (1) use of the phrase “claimed invention,”
 which replaces “invention” used in the pre-AIA version; 3
 and (2) addition of the catchall phrase “otherwise available
 to the public.” Appellant Br. 16, 20. Based on these textual
 changes, Celanese asserts, post-AIA, sales of a product
 made using a claimed process invention, without publicly


      3    Compare 

35 U.S.C. § 102

 (2006) (“A person shall be
 entitled to a patent unless . . . (b) the invention was . . . on
 sale . . . .”), with AIA § 102(a) (“A person shall be entitled
 to a patent unless— (1) the claimed invention was . . . on
 sale . . . .” (emphasis added)).
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 CELANESE INTERNATIONAL CORPORATION v. ITC                  11



 disclosing the process, would no longer trigger the on-sale
 bar. Id. at 17, 20. So as a result, Celanese says, its prior
 sales of Ace-K cannot place its process invention “on sale”
 to trigger the on-sale bar and invalidate its later-sought
 patent claims on that process. We are not persuaded.
     Starting with the addition of “claimed,” Celanese con-
 tends that this added word means that the on-sale bar now
 requires the “claimed invention” itself be on sale. Id. at 17.
 There is no dispute that the “claimed invention” here is the
 process Celanese used to make Ace-K. The dispute is: what
 it means for a claimed process invention to be placed on
 sale to trigger the on-sale bar. Celanese argues, contrary
 to pre-AIA precedent, that sales of products made using a
 secret process cannot trigger the AIA’s on-sale bar. See id.
 Celanese’s argument would have us find a foundational
 change to the on-sale bar as a patentability condition for
 process inventions.
      The addition of the word “claimed” does not support the
 foundational change Celanese would have us find. For Sec-
 tion 102’s on-sale bar purposes, whether “invention” or
 “claimed invention” is used, the statutory language refer-
 ences the same “invention” that an applicant seeks to pa-
 tent, and nothing else. Our caselaw has, in addressing the
 on-sale bar, interchangeably referred to the invention at is-
 sue as the “claimed” invention. See, e.g., Pfaff, 

525 U.S. at 68

 (discussing sales of products containing elements of
 “the invention claimed in the [patent at issue]” (emphasis
 added)); Medicines, 

827 F.3d at 1374

 (discussing sales of
 products made using a “claimed processes or methods” (em-
 phasis added)); Kollar, 

286 F.3d at 1333

 (discussing com-
 mercialization of a product made using a “claimed process”
 (emphasis added)); Caveney, 

761 F.2d at 675

 (discussing
 the effect of sales of a “claimed invention” on patentability
 (emphasis added)). Consistent with existing judicial con-
 struction, that Congress elected to use the “claimed inven-
 tion” alternative reflects no more than a clerical refinement
 of terminology for the same meaning in substance.
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 12              CELANESE INTERNATIONAL CORPORATION v. ITC




     Turning next to the added catchall phrase, “or other-
 wise available to the public,” Celanese argues this phrase
 “confirms that the AIA’s on-sale provision excludes sales of
 a product that do not disclose the inventive process.” Ap-
 pellant Br. 20. Celanese’s proposition requires that under
 the AIA, the details of the claimed invention must be dis-
 closed to the public for the on-sale bar to apply.
     Helsinn posited Celanese’s proposition, and the Su-
 preme Court explicitly rejected it. Helsinn, 

586 U.S. at 131

.
 We conclude the same here. Section 102 enumerates sev-
 eral categories of “conditions for patentability,” which in-
 clude that the invention cannot be previously “patented,”
 “described in a printed publication,” or “on sale.” The “on
 sale” category, as the Court explained, has never required
 that a qualifying commercial sale reveal to the public the
 details of the claimed invention. 

Id. at 125, 130

. The
 catchall phrase, “or otherwise available to the public,” “cap-
 tures material that does not fit neatly into the statute’s
 enumerated categories but is nevertheless meant to be cov-
 ered.” 

Id. at 132

. The addition of this phrase, however, “is
 simply not enough of a change” to conclude “that Congress
 intended to alter the meaning of the reenacted term ‘on
 sale.’” 

Id. at 131

.
      The rationale behind the on-sale bar further confirms
 our conclusion. Whatever the type of invention, the on-sale
 bar precludes one from commercially exploiting the inven-
 tion and then continuing that exploitation through a pa-
 tent, effectively extending the statutory patent term. See,
 e.g., Pfaff, 

525 U.S. at 68

. Contractually, a commercial sale
 profiting from a patented product may vary in form from a
 sale involving a patented process. See, e.g., Kollar, 

286 F.3d at 1332

. The Supreme Court’s and this court’s prece-
 dents have long recognized this distinction and further rec-
 ognized the importance of this distinction relevant to the
 on-sale bar. See, e.g., Pennock, 

27 U.S. at 14

 (addressing
 the on-sale bar as applied to the patented process of “mak-
 ing leather tubes or hose”); Kollar, 286 F.3d at 1332–33. As
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 CELANESE INTERNATIONAL CORPORATION v. ITC                 13



 relevant here, for patented processes, the on-sale bar ap-
 plies when one commercially exploits the process by seek-
 ing compensation from the public for carrying out that
 process before the critical date. See, e.g., Medicines, 

827 F.3d at 1374

; see also BASF Corp. v. SNF Holding Co., 

955 F.3d 958, 969

 (Fed. Cir. 2020) (discussing the manners in
 which a process can be “sold” for on-sale bar purposes).
     We discern no support for Celanese’s proposition that
 Congress intended to alter the on-sale bar as applied to pro-
 cess inventions, or to disturb the underlying rationale in
 our caselaw.
                              ii.
     Celanese next argues that certain other provisions of
 the AIA, including Sections 102(b), 271(g), and 273(a), in-
 dicate that Congress intended to alter the scope of the
 on-sale bar. We conclude that none of these provisions
 changes the meaning of the on-sale bar or speaks to the
 facts here. And they do not support Celanese’s argument.
     Celanese first points us to the grace-period provision in
 Section 102(b). Section 102(b)(1) provides a one-year grace
 period for “disclosures” made “by the inventor” within a
 year before he seeks a patent. 4 Celanese contends that if
 the on-sale bar continues to apply to the inventor’s “secret
 commercialization,” “[n]o grace period would exist for [Sec-
 tion] 102(a)(1) conduct by the inventor that involves no dis-
 closure.” Appellant Br. 25 (emphasis added). So according
 to Celanese, this would cause a “mismatch” between




     4    

35 U.S.C. § 102

(b)(1), in pertinent part, provides
 that “[a] disclosure made [by the inventor] 1 year or less
 before the effective filing date of a claimed invention shall
 not be prior art to the claimed invention under subsec-
 tion (a)(1)[.]”
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 14              CELANESE INTERNATIONAL CORPORATION v. ITC




 Section 102(a)(1)’s     on-sale    provision      and      Sec-
 tion 102(b)(1)’s grace period. 

Id.

 at 23–25.
     Section 102(b)(1) and its grace period do not alter our
 understanding of the on-sale bar under Section 102(a)(1)
 here. As Jinhe points out, Section 102(b)(1)’s grace-period
 provision is not implicated here because Celanese’s prior
 sales at issue occurred well outside of the one-year
 grace-period window. Intervenor Br. 38. We need not, and
 decline the invitation to, construe term(s) in Sec-
 tion 102(b)(1). Ultimately, Celanese’s argument rests on
 the proposition that a sale must disclose details of the
 claimed invention to the public before it triggers the
 on-sale bar. See, e.g., Appellant Br. 24 (to trigger the
 on-sale bar under Section 102(a)(1), “the claimed invention
 must have been disclosed to someone”). As discussed su-
 pra, we reject that proposition.
     Second, to support its contention that Congress altered
 the “on sale” provision in Section 102(a), Celanese points to
 Section 271(g) (infringement by third parties) and Sec-
 tion 273(a) (third-party infringement defense). 5 

Id. at 19, 26

. Regarding section 271(g), Celanese relies on the refer-
 ence to “a product which is made by a process,” a reference
 that does not appear in Section 102(a)’s on-sale provision.
 

Id.

 at 19–20. This textual difference, Celanese asserts, is
 further indication that Congress meant for Section 102(a)’s


      5    See 

35 U.S.C. § 271

(g) (“Whoever without authority
 imports into the United States or offers to sell . . . a product
 which is made by a process patented in the United States
 shall be liable as an infringer[.]”); 

id.

 § 273(a)(1) (providing
 a third-party prior-use defense against infringement if
 “[it], acting in good faith, commercially used the [patented]
 subject matter in the United States, either in connection
 with an internal commercial use or an actual arm’s length
 sale or other arm’s length commercial transfer of a useful
 end result of such commercial use”).
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 CELANESE INTERNATIONAL CORPORATION v. ITC                  15



 on-sale bar to no longer encompass sales of products made
 using a secret process. See id. Celanese also contends that
 if Section 102(a)’s on-sale bar applies to sales of products
 made using a secret process, it would render Sec-
 tion 273(a)’s prior-use defense superfluous. Id. at 26–27.
 We find scant merit in Celanese’s contentions.
     Sections 271(g) and 273(a) both concern infringement
 and third-party actions, and we fail to see how they would
 govern the interpretation of Section 102(a)’s on-sale bar.
 The cited sections do not concern patentability, or what ac-
 tions of an inventor or applicant may preclude him from
 obtaining a valid patent, as provided in Section 102. In-
 stead, the cited sections address what actions by a third
 party may lead to the liability for infringing a valid patent.
      Patentability (or validity) and infringement are dis-
 tinct issues concerning different actors and actions, gov-
 erned by different frameworks with different rationales.
 Commil USA, LLC v. Cisco Sys., Inc., 

575 U.S. 632, 644

 (2015). As the Commission noted, “Section 273 provides an
 infringement defense to one using a method prior to the
 patenting of that method by another; the question of
 whether the same operative facts will invalidate the patent
 is entirely distinct.” ITC Decision, 

2022 WL 142328

, at *7
 (citing BASF Corp., 

955 F.3d at 968

); see W.L. Gore, 

721 F.2d at 1550

 (distinguishing, relevant to the on-sale bar,
 the effect of the inventor’s own commercialization and that
 by a third-party). The fact that Congress elected to write
 infringement-related sections in a certain way does not
 support a conclusion that Congress meant to rewrite sec-
 tions on patentability or validity. Accordingly, we are not
 persuaded the cited sections show that Congress intended
 to alter Section 102’s on-sale bar.
                              iii.
     Celanese also argues that the AIA’s legislative history
 indicates that Congress intended to remove sales like
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 16              CELANESE INTERNATIONAL CORPORATION v. ITC




 Celanese’s prior sales here from the scope of the on-sale
 bar. We are not persuaded.
     Celanese primarily relies on a colloquy between two
 senators, which was referenced in a footnote accompanying
 the background section of a committee report. See Appel-
 lant Br. 45–46 (citing H.R. Rep. No. 112-98, at 43 n.20
 (2011)). In that colloquy, Senator Leahy stated his view
 that “subsection 102(a) was drafted in part to do away with
 precedent under current law that private offers for sale or
 private uses or secret processes practiced in the United
 States . . . may be deemed patent-defeating prior art.” 157
 Cong. Rec. S1496–97 (daily ed. Mar. 9, 2011) (cited at H.R.
 Rep. No. 112-98, at 43 n.20 (2011)). Celanese argues this
 statement shows that Congress altered pre-AIA law to re-
 quire that triggering sales under Section 102(a) must dis-
 close details of the invention to the public. See Appellant
 Br. 45–46. We disagree.
     Individual legislators’ views, isolated from the context
 of years of debate in the legislative process, do not mean-
 ingfully establish congressional intent. The Supreme
 Court has repeatedly cautioned against relying on legisla-
 tive materials like committee reports, or individual legisla-
 tors’ views, to interpret statutory text. See, e.g., Exxon
 Mobil Corp. v. Allapattah Servs., Inc., 

545 U.S. 546, 568

 (2005) (“[L]legislative history is itself often murky, ambig-
 uous, and contradictory.”).
     Helsinn relied on the same colloquy to support the
 same proposition extended by Celanese, which both this
 court and the Supreme Court rejected. See, e.g., Helsinn I,
 855 F.3d at 1368–69. As we explained, the cited state-
 ments, viewed in context, at most concerned “public use”
 and failed to support “a foundational change in the theory
 of the statutory on-sale bar.” See 

id.

 We reach the same
 conclusion here. And we reiterate the Supreme Court’s
 holding that, to trigger the on-sale bar, a sale need not
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 CELANESE INTERNATIONAL CORPORATION v. ITC                17



 “make the details of the invention available to the public.”
 Helsinn, 

586 U.S. at 125

; 

id. at 131

.
     Accordingly, we hold that the enactment of the AIA did
 not constitute a foundational change in the theory of the
 statutory on-sale bar provision, 

35 U.S.C. § 102

(a)(1), in
 particular, to require that sales of products made using a
 secret process cannot trigger the on-sale bar. We conclude
 that Celanese fails to show the AIA overturned settled
 precedent that pre-critical date sales of products made us-
 ing a secret process preclude the patentability of that pro-
 cess. Celanese’s pre-2015 sales of Ace-K made using its
 secret process thus trigger the on-sale bar and preclude pa-
 tentability of that process. Those sales thus render invalid
 Celanese’s later-sought patent claims on that process.
                        CONCLUSION
     We have considered Celanese’s remaining arguments
 and find them unpersuasive. For the reasons set forth
 above, we conclude that Celanese’s claims at issue are in-
 valid under the on-sale bar in AIA Section 102. Accord-
 ingly, the Commission’s judgment is affirmed.
                        AFFIRMED
                            COSTS
 Costs against Appellant.