MILLER, Associate Justice.
On January 13, 1933, appellant George S. Kelley filed with the Commissioner of Patents an application for a patent upon claims involving new and useful improvements in methods of dust removal. The twenty-one claims of the application were rejected by the Examiner on the ground that they showed no invention over the prior art. The Board of Appeals affirmed the Examiner's rejection. Two petitions for rehearing were filed before the Board;...
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