Wensel

This is a suit in equity to restrain an alleged infringement of letters patent No. 1,574,222, of which plaintiff is assignee', and for an accounting. -The'defenses interposed are lack' of invention and noninfringement.

The patent involves' new and useful improvements in door and window bolts and the specifications state that .the invention relates to bolts for fastening' doors, window sashes, gates, and the like and especially to means* for placing a frictional drag on sliding bolt bars to fnationally.retain them in the position in which they were last manually set. The required frictional drag on the bolt bar is obtained by the insertion of a spring between the bar and the bolt plate, and in this way the necessity and expense of accurately fitting the bolt bar to its keepers is eliminated, the spring taking up all play between them. The patent further specifies:

A preferred form embodying the claimed invention is described and illustrated with this limitation:

From the evidence in this suit, I believe this invention marks progress in the industry of door and window bolt structures, and is a decided improvement over the prior art as disclosed by the record herein. I shall not…