Authorities Cited: United States Patent and Trademark Office U.S. Patent No. 5,012,126 U.S. Patent No. 5,162,666 United States Code 35 U.S.C. § 103 35 U.S.C. § 103(a) Supreme Court 517 U.S. 370 Circuit Courts 713 F.2d 1530, 1535 52 F.3d 967, 979 138 F.3d 1448, 1456 149 F.3d 1350, 1357 175 F.3d 994, 999 203 F.3d 1305, 1319 211 F.3d 1367, 1372 217 F.3d 1365, 1369 308 F.3d 1317, 1320 415 F.3d 1303 418 F.3d 1361, 1365 464 F.3d 1356, 1361-1367