RADER, Circuit Judge.
Envirco Corporation (Envirco) sued Clestra Cleanroom, Inc. (Clestra) in the United States District Court for the Northern District of New York for infringement of its U.S. Patent No. 4,560,395 ('395 patent), which covers a centrifugal fan and filter assembly for clean room environments. The district court granted Clestra's motion for summary judgment of non infringement. Because the district court erred in construing the claims-in-suit and finding...
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