RICH, Judge.
This appeal is from a decision of the Patent Office Board of Appeals, affirming the rejection of claims 11-19 of application serial No. 660,767, filed May 22, 1957, entitled "Dental Prostheses and Dental Aids." No claim has been allowed.
The invention is a dental prosthetic device, for example, a denture, in which polycarbonate resin is employed in the manufacture of the "gum" portion. Claim 11 is typical:
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