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The Trade-Mark Cases, 100 U.S. 82 (1879), were a set of three cases consolidated into a single appeal before the United States Supreme Court, which in 1879 unanimously ruled that the Copyright Clause of the Constitution gave Congress no power to protect or regulate trademarks. Congress then passed the Trade Mark Act of 1881, which was based on the Commerce Clause power, and therefore passed constitutional muster.
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