MR. CHIEF JUSTICE STONE delivered the opinion of the Court.
The question for our decision is whether a patent licensee, by virtue of his license agreement, is estopped to challenge a price-fixing clause in the agreement by showing that the patent is invalid, and that the price restriction is accordingly unlawful because not protected by the patent monopoly.
Respondent brought the present suit in the District Court for the Northern District of Illinois, asserting...
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