CHASE, Circuit Judge.
The issues on this appeal are whether claim 2 of the plaintiff's United States Patent No. 2,161,198, granted to it on June 6, 1939, as the assignee of Laszlo Reiner, the applicant, for an "Insulin Preparation" is valid and, if valid, whether it has been infringed by the defendant.
Insulin was discovered by Banting and his fellow workers in 1922. In about a year standard insulin, as later adopted by the United States Pharmacopoeia, which...
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