E.I. du Pont de Nemours & Co.

E.I. du Pont de Nemours and Company — "DuPont" — is the historic legal name of the Delaware chemicals and materials firm, incorporated in Delaware in 1915 and founded in 1802. The operating business today is DuPont de Nemours, Inc. (NYSE: DD), headquartered at 974 Centre Road, Wilmington, Delaware. It is publicly traded. Following the 2017 DowDuPont merger and the 2019 three-way separation (Dow Inc., Corteva Agriscience, DuPont), the company has continued to shrink: it spun off its semiconductor/interconnect business as Qnity Electronics on Nov. 1, 2025, divested the Aramids (Kevlar/Nomex) business on April 1, 2026, and executed a 1-for-3 reverse stock split in June 2026. Fortune lists roughly 15,000 employees; 2026 guidance is approximately $7.16–7.19 billion in net sales.

Operations. DuPont today reports two segments: Healthcare & Water Technologies (medical packaging and devices, biopharma materials such as Liveo, industrial and semiconductor ultrapure water, filtration/purification systems) and Diversified Industrials (Building Technologies and Industrial Technologies, including aerospace applications). The broader DuPont franchise historically manufactured commodity and specialty chemicals and materials including nylon, Teflon, Kevlar, Tyvek, and Mylar.

Patent-litigation posture. This is an operating company, not a non-practicing entity. Tracked data show 1 case as plaintiff and 0 as defendant — a single, decades-old dispute rather than any assertion campaign.

Notable case. E.I. du Pont de Nemours & Co. v. Cetus Corporation, in the Northern District of California (San Francisco). DuPont filed a declaratory-judgment action challenging the validity of Cetus's polymerase chain reaction (PCR) patents, arguing the technique was anticipated by early-1970s MIT research. The court declined to invalidate the patents; Cetus subsequently sold its PCR rights to Hoffmann-La Roche in 1991. The venue was N.D. Cal., not an NPE-favored district such as the Eastern District of Texas.