Legal Opinion
United States Gypsum Company v. National Gypsum Company
Court of Appeals for the Federal Circuit
Decided February 27, 1996No. 95-1254PublishedCited by 79 opinions
1Opinion of the Court
LOURIE, Circuit Judge.
United States Gypsum Company (“USG”) appeals from the decision of the United States District Court for the Northern District of Illinois granting summary judgment of patent invalidity in favor of National Gypsum Company (“National”). 1 Because the court did not err in granting summary judgment, we affirm.
BACKGROUND
Joint compounds are adhesives used in the construction of building walls and ceilings to fill and coat the joints between adjacent gypsum wallboards. The patent in suit, U.S. Patent 4,454,267, assigned to USG, is directed to a lightweight joint compound.
In…
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