BRYSON, Circuit Judge.
Ballard Medical Products owns U.S. Patent Nos. 4,569,344 ("the '344 patent") and 4,696,296 ("the '296 patent"), which are drawn to ventilating and aspirating tracheobronchial catheters. Ballard sued Sorenson Critical Care, Inc., and Allegiance Healthcare Corp. (collectively "Sorenson") for infringement of multiple claims of the '344 and '296 patents. On summary judgment, the district court ruled that Sorenson had not infringed the disputed patents...
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