Civ. A. No. 88-3656-OG. November 14, 1990. Raymond G. Hasley, Michael Kushnick, Rose, Schmidt, Hasley DiSalle (E. Wallace Breisch, of counsel), Pittsburgh, Pa., for plaintiff. Fred E. McKelvey, Sol., Lee E. Barrett, Associate Sol., United States Patent and Trademark Office, Washington, D.C., for defendant. OPINION BENNETT, Senior Circuit Judge.[fn*] [fn*] Marion T. Bennett, Senior Circuit Judge, United States Court of Appeals for the Federal Circuit, sitting by designation. 28 U.S.C. § 291(b) (1988)