Chemical Const. Corp. v. Niagara Research Corp.

KNIGHT, Chief Judge.

This is an action for a judgment declaring United States patent 2,459,764 invalid and void and that plaintiffs have not' infringed its claims. Defendant counterclaims against plaintiff National Lead Company, alleging infringement and demanding an injunction, accounting and costs.

Plaintiff Chemical Construction Corporation is a Delaware corporation. Plaintiff National Lead Company is a New Jersey corporation. Defendant is a New York corporation, having its principal office at Buffalo in this District.

The patent is entitled “Purification of Native Sulfur”, was applied for…