CASTLE, Circuit Judge.
Novo Industrial Corporation, plaintiff-appellant, the owner of Lowther U. S. Patent No. 3,105,477, issued October 1, 1963, and relating to a crankcase ventilating system for internal combustion engines, brought this suit in the District Court against Standard Screw Company, defendant-appellee, charging infringement of the patent. The defendant denied infringement and asserted that the patent was invalid.
The District Court, following...
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