In re Field

Appellant appeals from a decision of the Board of Appeals of the United States Patent Office, affirming that of the Primary Examiner, finally rejecting all of the claims, 17,19 to 21, inclusive, and 23 to 27, inclusive, of an application for a patent, serial No. 504,774, filed October

2, 1943, alleging “Improvements in or relating to the production of screened positive or negative photographic plates,” as unpatentable over the following prior art:

Penrose et al. (Br.), 282,253. December 22,1927.

Half Tone Stops, by J. S. Mertle in The American Photoengraver, September 1929, Pages 937 to 951.

Claim…