MR. CHIEF JUSTICE STONE delivered the opinion of the Court.
In this patent infringement suit the question is whether the assignor of a patent is estopped by virtue of his assignment to defend a suit for infringement of the assigned patent on the ground that the alleged infringing device is that of a prior art, expired patent.
Automatic Paper Machinery Company, Inc., petitioner's assignor, acquired by assignment, from respondent Marcalus, Patent No. 1,843,429...
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