Defendant
1 case as defendant.
Dörken Systems, Inc. is the North American building-materials subsidiary of the German family-owned Ewald Dörken AG, headquartered in Herdecke, Germany (founded 1892). Dörken Systems itself is based in Beamsville, Ontario, Canada (4655 Delta Way), and operates as a private subsidiary rather than a public company. Parent-level public sources variously report roughly 1,000–1,400 employees and annual revenue in the €370–470 million range in recent years; standalone figures for the North American unit are not disclosed.
Products / services. Dörken Systems manufactures air- and moisture-barrier systems for commercial and residential construction, marketed under the DELTA® brand. Its line includes water-resistive and air barriers (e.g., DELTA®-VENT S/SA, DELTA®-STRATUS SA, DELTA®-FASSADE S/SA), roofing underlayments, drainage composites (DELTA®-DRAIN), ventilated rainscreen membranes (DELTA®-DRY & LATH, DELTA®-DRY STUCCO & STONE), and compatible accessory products — flashing, sealants, tapes, and primers. This is an operating manufacturer, not an NPE.
Patent-litigation posture. The case data show Dörken Systems as a defendant in one tracked suit and plaintiff in none — the classic profile of an operating company targeted by a patent assertion, not an asserter. The single tracked matter, Kirsch Research & Development, LLC v. Dörken Systems, Inc. (No. 5:20-cv-00056), was filed April 24, 2020 in the U.S. District Court for the Eastern District of Texas, a historically plaintiff-friendly venue.
Context. Kirsch Research & Development, LLC is an inventor-controlled litigation vehicle associated with Mark C. Strait that filed roughly 16 parallel suits that same day against roof-underlayment and building-products makers, asserting U.S. Patent Nos. 6,308,482 and 8,765,251 ("Reinforced roof underlayment and method of making the same"), plus related ITC proceedings. The docket in Dörken's case reflects extensions of time to answer and a voluntary dismissal without prejudice by Kirsch on August 3, 2020. No merits determination is recorded in the available materials.
Kirsch asserted the '482 patent against Dörken Systems. Kirsch moved to dismiss, and the case was dismissed without prejudice, with parties bearing their own costs and fees.