Duane A. Stewart III

Duane integrates complex science and legal matters at a high level. He specializes in explaining complex intellectual property law concepts in a way that is accessible. Duane is the co-chair of the firm’s Chemical Practice Group.

His patent practice includes preparation and prosecution of domestic and foreign utility and design patents in the pharmaceuticals, fragrance, home products and biotechnology fields. Duane has obtained multiple foreign and domestic patents in industrial water purification. He has significant experience managing international patent portfolios, having made and managed filings in more than 30 jurisdictions.

He has taken an active role in priority determinations in patent interferences and has participated in litigations involving allegations of patent infringement and copyright infringement. Duane’s particular patent focus is on use of PCT filings to obtain wide territorial coverage while satisfying the applicant’s business goals.

Duane’s trademark practice includes all phases of procurement and enforcement, including knockout searches, clearance opinions, watches, filings and oppositions. He has supervised foreign trademark filing both directly and through the Madrid Protocol, and he has filed foreign-origin applications in the United States.

Duane is a shareholder in the firm’s Intellectual Property Section and co-chair of its Chemical Practice Group. Before joining Buchanan, served for two years as a judicial law clerk with the Honorable David A. Katz of the United States District Court for the Northern District of Ohio in Toledo, Ohio.

Duane addresses client’s IP issues with effective strategy and pragmatic advice. He keeps the client’s business goals top of mind and makes sure that clients know that their matters have his attention.