MR. JUSTICE DOUGLAS delivered the opinion of the Court.
This suit was brought by respondent, Mid-Continent Investment Co., against petitioner, Mercoid Corporation, for contributory infringement of the Cross combination patent No. 1,758,146, issued May 13, 1930, for a domestic heating system. Mercoid in its answer denied contributory infringement and alleged that Mid-Continent should be barred from relief because it was seeking to extend the grant of the patent to...
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