Pennsalt Chemicals Corp. v. Dravo Corp.

Plaintiff, Pennsalt Chemicals Corporation, has sued defendant, Dravo Corporation, for a declaratory judgment deciding that a certain patent is invalid and also asking for an injunction and damages. Plaintiff avers that defendant is the exclusive licensee of Lorenz patent No. 3,-136,834.

Plaintiff also avers that this patent covers the manufacture, sale and use of certain degassing equipment used on molten steel in the steel producing industry ; that plaintiff manufactures and sells similar degassing equipment in the steel industry as an active competitor of defendant; that defendant has…