O'SULLIVAN, Circuit Judge.
This appeal asks reversal of a judgment holding invalid U. S. Patent No. 2,807,330, owned by plaintiff-appellant American Air Filter Company, Inc. as assignee of the alleged inventor, Richard D. Rivers. Plaintiff American brought this action charging infringement of the patent against defendant-appellee Continental Air Filters, Inc., in the United States District Court for the Western District of Kentucky. The District Judge, having heard...
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