Sears, Roebuck and Co. v. Stiffel Co.

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In Sears, Roebuck & Co. v. Stiffel Co., 376 U.S. 225, 231 (1964), the U.S. Supreme Court ruled that it is obvious that a State could not "extend the life of a patent beyond its expiration date."

Justice Hugo Black, who was generally opposed to most patent rights, wrote the opinion for a unanimous Court.