British Acoustic Films, Ltd. v. Electrical Research Products, Inc.

MARIS, Circuit Judge,

These cases involve the validity of claims 1 and 2 of the Poulsen and Peterson patent No. 1,597,819 issued August ’31, 1926, and claims 1, 2 and 3 of the Poulsen patent No. 2,006,719 issued July 2, 1935. They will be referred to herein as the first and second Poulsen patents. Subsidiary ques*264tions of infringement, if the patents are valid, are also involved. In separate suits by the plaintiff, the present owner of the patents, against the two defendants, alleged to be infringers, the District Court for the District of Delaware found the claims in suit to be invalid and not…