MR. CHIEF JUSTICE STONE delivered the opinion of the Court.
This is a suit in equity, brought in the District Court of the District of Columbia, under R.S. § 4915, to compel respondent, the Commissioner of Patents, to issue a patent upon an application for a subcombination of the elements of a machine for which the inventor had previously filed a patent application. The district court gave judgment for respondent. The Court of Appeals for the District affirmed...
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