JOHNSON, Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the Primary Examiner rejecting, as unpatentable over the prior art, claims 1 to 7, inclusive, which are all of the claims in appellants' application for a patent for a method for plasticizing scorched rubber stock.
Claims 1 and 3 are representative, and read as follows:
"1. The method of plasticizing scorched stock...
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