GRAHAM, Presiding Judge.
Appellant prays an appeal from the decision of the Board of Appeals of the United States Patent Office, which affirmed the decision of the Examiner in refusing to allow claims 1 to 7, inclusive, of appellant's application for a process and product patent upon furnace slag cement. Two of appellant's claims are as follows:
"1. Process for the manufacture of cement from lime and silicates consisting in the employment of solid vitrified...
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