39 F. 420 | U.S. Circuit Court for the Northern District of Illnois | 1889
This suit was brought by the plaintiffs as assignees oi letters patent No. 228,241, granted to 'Arnold W. Zimmerman on June 1,1880, against the defendant as an infringer. The patent describes and claims a device or mechanism for securely bolting or closing car and other doors, and for opening the same. The validity of the patent is not disputed, and the invention need not be more particularly described. The defendant is the owner of a number of patents for improvements in refrigerator cars, and the bill charges that the defendant has made, used, and