Appeal No. 86-721. October 14, 1986. Michael B. Fein, Rohm and Haas Co., Philadelphia, Pa., argued for appellants. With him on the brief was Carl W. Battle. Also on the brief was Rudolf E. Hutz, Connolly, Bove, Lodge Hutz, Wilmington, Del. Richard E. Schafer, Associate Sol., Arlington, Va., argued for appellee. With him on the brief were Joseph F. Nakamura, Sol. and Fred E. McKelvey. Appeal from the Board of Patent Appeals and Interferences. Before MARKEY, Chief Judge, BENNETT, Senior Circuit Judge