Cara's HW 4/4
Doctrine of Equivalence
United States Court of Appeals, Federal Circuit
Jerome H. Lemelson v. General Mills, Inc.
June 30, 1992
United States District Court for Northern District of Illinois found in favor of plaintiff. The United States Court of Appeals reversed.
Lemelson issued a patent for "Toy Track and Vehicle Therefor" (June 24, 1969).
Matel (Defendent-Appellant) began independent track development (1967). Researched the prior art (Lemelson's patent did not yet exist) and concluded that a few features of the track may be patentable. Patented features of Hot Wheels but not the actual track.