Unlawful Use of a Trademark in Commerce and the Affirmative Defense to Infringement

The Lanham Act imposes on a trademark’s owner the requirement that the mark be used lawfully in commerce. If it is not, the USPTO should refuse to register it, and if registered the registration should be canceled. As well, unlawful use of a trademark in commerce has been applied as an affirmative defense to infringement in the case of registered marks, and there is no basis to distinguish, for this purpose, registered and unregistered marks. It’s just that the tested cases have been with registered marks.

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