U.S. trademark law Edit

A senior user of a trademark or service mark is the first entity to adopt and use the mark anywhere in the United States.[1] "The [senior user] . . . has the right to enjoin 'junior' users from using confusingly similar marks in the same industry and market or within the senior user’s natural zone of expansion."[2]


  1. See Lucent Infor. Management, Inc. v. Lucent Technologies, Inc., 186 F.3d 311, 316, 51 U.S.P.Q.2d (BNA) 1545 (3rd Cir. 1999) (full-text), cert. denied, 528 U.S. 1106 (2000).
  2. Brookfield Comm., Inc. v. West Coast Entertainment Corp., 174 F.3d 1036, 1047 (9th Cir. 1999).(full-text)

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