Opinion ID: 504701
Heading Depth: 3
Heading Rank: 2

Heading: Pace Aid

Text: 51 The Pace Aid devices, on the other hand, do provide low current density, but because the district court's finding of literal infringement was predicated on an improper construction of the claims of the '030 patent that portion of the district court's judgment must be vacated and remanded. On remand the court must determine whether the claims as interpreted above read on the Pace Aid devices, and in particular the electrode element employed by such devices, or whether the Pace Aid devices infringe under the doctrine of equivalents. See Graver Tank, 339 U.S. at 608-09, 70 S.Ct. at 856, 85 USPQ at 330. Infringement requires that every limitation of the patent claim must be found in the accused device either literally or equivalently. See Pennwalt Corp. v. Durand-Wayland, Inc., 833 F.2d 931, 935, 4 USPQ2d 1737, 1739-40 (Fed.Cir.1987); Perkin-Elmer Corp. v. Westinghouse Elec. Corp., 822 F.2d 1528, 1532-33, 3 USPQ2d 1321, 1324-25 (Fed.Cir.1987). The party alleging infringement has the burden of proving infringement by a preponderance of the evidence. Uniroyal, Inc., 837 F.2d at 1054, 5 USPQ2d at 1441.