Opinion ID: 515826
Heading Depth: 1
Heading Rank: 3

Heading: standard of review

Text: 45 As an equitable issue, inequitable conduct is committed to the discretion of the trial court and is reviewed by this court under an abuse of discretion standard. We, accordingly, will not simply substitute our judgment for that of the trial court in relation to inequitable conduct. To overturn a discretionary ruling of a district court, the appellant must establish that the ruling is based upon clearly erroneous findings of fact or a misapplication or misinterpretation of applicable law or that the ruling evidences a clear error of judgment on the part of the district court. PPG Indus. v. Celanese Polymer Specialities Co., 840 F.2d 1565, 1572, 6 USPQ2d 1010, 1016 (Fed.Cir.1988) (Bissell, J., additional views) (discussing Seattle Box Co. v. Industrial Crating & Packing Inc., 756 F.2d 1574, 1581, 225 USPQ 357, 363 (Fed.Cir.1985); Amstar Corp. v. Envirotech Corp., 823 F.2d 1538, 1542, 3 USPQ2d 1412, 1415 (Fed.Cir.1987); Heat & Control Inc. v. Hester Indus., Inc., 785 F.2d 1017, 1022, 228 USPQ 926, 930 (Fed.Cir.1986)). Effect of Inequitable Conduct 46 When a court has finally determined that inequitable conduct occurred in relation to one or more claims during prosecution of the patent application, the entire patent is rendered unenforceable. We, in banc, reaffirm that rule as set forth in J.P. Stevens & Co. v. Lex Tex Ltd., 747 F.2d 1553, 1561, 223 USPQ 1089, 1093-94 (Fed.Cir.1984), cert. denied, 474 U.S. 822, 106 S.Ct. 73, 88 L.Ed.2d 60 (1985).