Appeal No. 79-597. March 13, 1980. Rehearing Denied July 3, 1980. Robert F. Dropkin and Vincent G. Gioia, Pittsburgh, Pa., attorneys of record for appellants. Joseph F. Nakamura, Washington, D.C., for the Commissioner of Patents and Trademarks, John W. Dewhirst, Washington, D.C., of counsel. Appeal from the Patent and Trademark Office Board of Appeals. Before MARKEY, Chief Judge, and RICH, BALDWIN, MILLER and MALETZ, Judges. The Honorable Herbert N. Maletz of the United States Customs Court, sitting