Sears, Roebuck & Co. v. Stiffel Co., 376 U.S. 225 (1964), was a United States Supreme Court case which limited state law on unfair competition when it prevents the copying of an item that is not covered by a patent. Justice Hugo Black wrote for a unanimous Court that the Constitution reserved power over intellectual property such as patents to the federal government exclusively. Since the trial court had found Stiffel's patent invalid as insufficiently inventive, its product design was thus in the public domain and no state law could be used to prevent Sears from copying it.