Activated Sludge, Inc. v. Sanitary Dist. of Chicago

EVAN A. EVANS, Circuit Judge.

This suit was begun in September, 1924, by Activated Sludge, Limited, an English corp oration, and Edgar C. Guthard, its American licensee, to enjoin the infringement, by the Sanitary District of Chicago, of sis letters patent belonging to plaintiffs. Defendant answered and filed a counterclaim seeking damages for fraudulent conduct growing out of the alleged misuse of said patent monopolies.

Both parties then sought and secured permission to take depositions abroad. In February, 1927, appellant herein purchased the patents in suit and then asked leave to file a…