National Sponge Cushion Co. v. Allen Industries, Inc.

employer who fails to sign agreement and evinces no intent to be bound is not required to make contributions | The written agreement with the employer may be a “written collective bargaining agreement or any other written agreement.” | statute requires denial of pension benefits to 28-year employee of employer that made contributions to trust fund without ever having signed a written agreement; nor does statutory language permit application of equitable estoppel | patent obtained by intentional and material misrepresentation to patent office | equitable estoppel cannot supply missing writing