GRAHAM, Presiding Judge.
The appellant filed his application in the United States Patent Office on August 16, 1928, for a patent upon certain improvements in valves for pumps used in pumping liquids containing large quantities of solid matter. Many claims were attached to the application. Some of these were allowed. Claims 23, 24, 26, 27, and 28 were rejected by both tribunals in the Patent Office, and are brought here on appeal. Claims 24 and 27 are thought to be...
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