Opinion · Supreme Court of the United States

Slawson v. Grand Street Railroad

107 U.S. 649

Type
Opinion
Court
Supreme Court of the United States
Jurisdiction
Federal
Date
1883-04-23
Topic
general

*652 Mr. Justice. Woods, after stating the facts, delivered the opinion of the court. The appellant insists that the dismissal of a bill because the inventions described in the patents were not patentable, when no such defence was set up in the answer, is of doubtful propriety, and is a practice unfair to complainants. The practice was sanctioned by this court in Dunbar v.

Citator

UpLaw has not yet analyzed Slawson v. Grand Street Railroad. The absence of a flag is not a finding that it is good law.

Cited by
122 opinions

Headnotes

  1. Patent Law — Sua Sponte Dismissal for Want of Patentability A court must dismiss a suit brought to restrain infringement of letters-patent, on its own motion and even though the defense is not set up in the answer, where the device or contrivance for which the letters were granted is not patentable; the question whether the subject-matter in controversy is patentable is always open to the court's consideration, and a court of equity will not render a money decree for infringement of letters-patent that are void on their face for want of invention. 107 U.S. at 649
  2. Patent Law — Patentable Invention — Duplication of Parts Merely placing an additional pane of glass in an ordinary fare-box opposite the pane next the driver, so that passengers can see the interior of the box, does not embody or require invention and is not patentable, as it is a mere duplication of an existing element requiring no more ingenuity than putting an additional pane of glass in a showcase or an additional window in a room opposite one already there; it is not every improvement that embodies a patentable invention, and a change involving only mechanical skill is not patentable. 107 U.S. at 649
  3. Patent Law — Patentability — New Application of Old Elements A contrivance for lighting the interior of a fare-box at night using the car's head-lamp, where the fare-box, head-light, and reflector are all old elements and what is claimed is simply making an aperture in the top of the box and turning the rays of the head-lamp through it by means of a reflector, is not patentable, because turning the rays of light to the spot where they are wanted by a reflector and removing an obstruction to their passage is a new application of old devices that does not involve invention. 107 U.S. at 649