Court of Appeals for the Eighth Circuit August 28, 1964, 17415, 17419 (Ditto, Incorporated v. Minnesota Mining & Manufacturing Company, Minnesota Mining & Manufacturing Company v. Ditto, Incorporated)

VAN OOSTERHOUT, Circuit Judge.

Plaintiff Minnesota Mining & Manufacturing Company (3M) brought this action for infringement of United States Letters Patent No. 2,740,896 entitled “Method of Using Heat Sensitive Copying Paper” granted 3M upon application of inventor Miller on April 3, 1956, against defendant Ditto, Incorporated.