Al-Site Corp. v. VSI International, Inc.
Court of Appeals for the Federal Circuit
174 F.3d 1308 (1999)
Relevant factsFree
Magnavision/Al-Site (plaintiff) sued VSI (defendant) for infringing patents on eyeglass-display structures; the district court's claim construction limited claims using "means plus function" language to only the specific structures disclosed in the specification, narrowing the claims more than Magnavision wanted, and Magnavision appealed that construction.
IssueFree
Whether the statutory limitation under 35 U.S.C. § 112, paragraph 6 applies whenever a patent claim uses "means plus function" language.