LOURIE, Circuit Judge.
Ultra-Tex Surfaces, Inc. and Dryvit Systems, Inc. (collectively "Ultra-Tex") appeal from the decision of the United States District Court for the Central District of California holding that Hill Brothers Chemical Co. and Omega Products Corp. did not infringe claim 6 of U.S. Patent 5,502,941 under the doctrine of equivalents. See Ultra-Tex Surfaces, Inc. v. Hill Bros. Chem. Co., Nos. SA CV 96-1230, -1232 GLT (EEx) (C.D.Cal. Aug. 21, 1998...
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