Authorities Cited: United States Patent and Trademark Office U.S. Patent No. 6,049,928 Circuit Courts 988 F.2d 1165, 1171 90 F.3d 1576, 1583 138 F.3d 1448, 1454 191 F.3d 1356, 1364 224 F.3d 1308, 1317 262 F.3d 1258, 1268 319 F.3d 1357, 1367 415 F.3d 1303, 1313 448 F.3d 1324, 1333 451 F.3d 841, 848 503 F.3d 1295, 1305

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