Application of Myron J. Jursich and Gail T. Randich

WORLEY, Chief Judge.

The issues here are whether the Board of Appeals committed reversible error in sustaining the examiner’s rejection of claims 1-51 as unpatentable over British patent 883,973 under 35 U.S.C. § 103, and on the ground of double patenting in view of the claims of Stephenson patent 3,256,1412 considered with Australian patent 163,501.

The invention is reflected in claim 1:

1. A method of improving the retention of filler and fiber fines in the processing of paper which comprises the step of adding to an aqueous paper pulp suspension at least a retention improving dosage of an…