ELY, Circuit Judge:
Each of the parties owns a patent pertaining to the design and construction of corneal contact lenses. Appellant, the defendant below and hereinafter called Plastic, holds the rights to the so-called Tuohy patent, Number 2,510,438. It is senior to that called the Butterfield patent, Number 2,544,246, owned by George H. Butterfield, Sr. As plaintiff, Butterfield was successful in the court below, and Plastic appeals.
The present dispute...
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