MacMAHON, District Judge.
This is an action for patent infringement tried by the Court without a jury. The patent involved was issued to John T. Correll on March 29, 1949 for a surgical sponge made of gelatin foam hardened to water insolubility and absorbable by a living body in from ten to ninety days.
Plaintiff, The Upjohn Company, a Michigan corporation, is assignee of the patent and manufactures and sells the surgical sponge under the trademark "Gelfoam...
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