Alexsam, Inc. v. Idt Corporation

Opinion for the Court filed by Circuit Judge DYK.

Dissenting opinion filed by Circuit Judge MAYER.

DYK, Circuit Judge.

Defendant IDT Corporation appeals from the judgment of the District Court for the Eastern District of Texas determining that certain of IDT’s systems infringed claims 57 and 58 of U.S. Patent No. 6,000,608 (“the '608 patent”), and that these claims were not invalid. Plaintiff Alexsam, Inc. cross-appeals from the court’s judgment determining that certain other systems were licensed under claims 57 and 58 of the '608 patent.

We affirm the judgment of no invalidity. We reverse the…