Curtis Companies, Inc. v. Master Metal Strip Service, Inc.

KERNER, Circuit Judge.

This is an appeal from a decree dismissing plaintiff’s suit for infringement of the Madsen patent, No. 1869760, issued August 2, 1932, and disclosing a weatherproof window construction. The District Court held claims 10, 13 and 14 of the patent invalid in view of prior patents.

The patentee’s claim 10, typical of the others, is copied in footnote 1.

Prior to 1932 most of the windows commercially used were ordinary double hung windows in which two sash slide up and down in the frame under control of sash cords, weights and pulleys.

In the Madsen window they are hung on…