DUNCAN, District Judge.
Plaintiff, a corporation, organized under the laws of the State of Iowa, is the owner of Letters Patent No. 2,450,866 issued October 5, 1948, on an application filed October 4, 1946, titled "Poultry Treatment Composition." It consists essentially of a chemical compound known as 3 nitro-4-hydroxy-phenyl-arsonic acid and an orally ingestible vehicle, such as water or feed, wherein said compound is dissolved or dispersed in certain efficacious...
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