Authorities Cited: United States Patent and Trademark Office U.S. Patent No. 5,628,338 United States Code 28 U.S.C. § 1295(a)(1) Supreme Court 339 U.S. 605, 608 520 U.S. 17, 29-40 Circuit Courts 904 F.2d 677, 684 15 F.3d 1573, 1576 90 F.3d 1558, 1567 90 F.3d 1576, 1582 138 F.3d 1448, 1454 141 F.3d 1084, 1090 149 F.3d 1309, 1315 285 F.3d 1046, 1052 288 F.3d 1359 299 F.3d 1313, 1326 395 F.3d 1364, 1372 406 F.3d 1359, 1364 415 F.3d 1303, 1312 418 F.3d 1225, 1231 424 F.3d 1293, 1307 441 F.3d 945, 950 479 F.3d 1320, 1324-1326 486 F.3d 1376, 1382-1383