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  • Al-Site Corp. v. VSI International, Inc.Al-Site Corp. v. VSI International, Inc.
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Al-Site Corp. v. VSI International, Inc.

Court of Appeals for the Federal Circuit
174 F.3d 1308 (1999)


Magnavision, previously known as Al-Site, (plaintiff) sued VSI (defendant) for infringement of several patents directed to structures that permitted display of non-prescription glasses where a potential customer could try on the glasses. After a jury trial, Magnavision prevailed on literal infringement of one patent, but lost on the issue of literal infringement on the other patents. The jury found infringement under the doctrine of equivalents as to those other patents. In the claim construction decision, the district court concluded that, where the claims recited a “means plus function” type of language, only those specific structures disclosed in the specification were included within the scope of the claim. Magnavision appealed the district court’s claim construction, which resulted in claims that were narrower than Magnavision desired.

Rule of Law


Holding and Reasoning (Rader, J.)

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