Wolff v. E. I. Du Pont De Nemours & Co.

LANNING, District Judge.

By their bill of complaint the appellants seek an injunction to restrain the appellee from an alleged infringement of letters patent No. 429,516, issued June 3, 1890, to Richard Von Freeden, and by him duly assigned to the appellants. The Circuit Court dismissed the bill, and the cause is now before us on appeal from the decree of that court.

The appellants’ patent is for an improvement in the manufacture of smokeless gunpowder from nitrocellulose, a substance commonly known as “gun cotton.” The process referred to in the first claim of the patent, the successive steps…