PLAGER, Circuit Judge.
The United States District Court for the Southern District of Texas granted summary judgment of non-infringement of U.S. Patent No. 5,221,470 ("the '470 patent") against Clearstream Wastewater Systems, Inc. and Jerry L. McKinney (collectively "Clearstream"), and in favor of Hydro-Action, Inc. and T. Gig Drewery (collectively "Hydro-Action"). See Clearstream Wastewater Sys., Inc. v. Hydro-Action, Inc., No. H-95-5233 (S.D.Tex. Feb.4, 1999...
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