MR. JUSTICE PECKHAM, after stating the facts, delivered the opinion of the court.
I. The defendant in error insists that his patent is conclusive evidence that he is a purchaser within the meaning of the seventh section of the statute above quoted, and that no fraud being alleged, no evidence can be received for the purpose of in any other way invalidating the patent issued to him by the Government of the United States.
The patent does not preclude this court...
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