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Stewart, Douglas F.
Douglas F. Stewart
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F: +1.800.404.3970

Andrea Kato


A registered patent attorney, Doug Stewart's practice encompasses all aspects of intellectual property and technology litigation and counseling, including patents, trademarks, trade secrets, copyrights, and domain names. 

Doug litigates patent and other intellectual property disputes in courts throughout the United States, including key patent jurisdictions such as the Eastern District of Texas, the District of Delaware, and the Northern and Central Districts of California, with a particular emphasis on assisting international technology companies with U.S. patent issues.  Doug also represents companies in Section 337 actions before the International Trade Commission, appeals to the Federal Circuit, and contested administrative proceedings before the PTAB and the TTAB.

In addition, Doug represents and advises clients in connection with non-litigated IP issues, including licensing and IP strategy; patent portfolio and prosecution management; technology agreements; patent royalty audits; and related diligence issues.

Doug’s experience spans a wide range of technologies, including computer hardware and software, consumer electronics, image processing and LED technology, data transmission and encryption, telematics, mechanical devices, and chemical and pharmaceutical compounds, among others.

A frequent lecturer on topics related to patent law and patent litigation, Doug has been an adjunct professor at the University of Washington School of Law since 2007 where he teaches a patent litigation course in the Intellectual Property LLM program.  Doug is also a lecturer for the Summer Institute hosted by the Center for Advanced Study and Research in Intellectual Property at the University of Washington (CASRIP).

Representative Matters

E2E Processing, Inc. v. Nordstrom, Inc. (patent infringement, E.D. Texas;  XML-based database query and data management)

CyberFone Systems, LLC v. Cisco Systems, Inc., et al. (patent infringement, D. Del.;  operating systems and applications for database access)

Pantaurus LLC v. Toshiba America Information Systems, Inc. (patent infringement, E.D. Texas;  system for hard drive data security) 

Whetstone Electronics, LLC v. Xerox Corp., et al. (patent infringement, E.D. Texas; computer controlled printer technology)

In re Certain Motion-Sensitive Sound Effects Devices and Image Display Devices and Components and Products Containing Same (patent-based 337 action, ITC; video signal circuitry and processing techniques)

Ogma LLC v. 3M Company, et al. (patent infringement, E.D. Texas; video signal circuitry and processing techniques)

Demeter Technology, LLC v. Fujitsu Computer Products, et al. (patent infringement, E.D. Texas; email and facsimile technology)

Takion Co. Ltd. v. General Electric Co., et al. (patent infringement, W.D. Washington; power supply and controllers for LED lamps)

Washington Research Foundation v. Matsushita Electrical Industrial Co., Ltd. (patent infringement, W.D. Washington; radio frequency receiver technology)

PACid Group, LLC v. Apple Inc., et al. (patent infringement, E.D. Texas; data encryption)

Airbiquity Inc. v. AT&T Inc., et al. (patent infringement, W.D. Washington; data communication over digital wireless networks)

New Medium v. Barco N.V., et al. (patent infringement, N.D. Illinois; video signal circuitry and processing techniques)

AT&T Intellectual Property v. Airbiquity Inc. (patent infringement, N.D. Texas; vehicle navigation technology)

Progressive Corp. v. Jarden (patent infringement, D. Delaware; design patent for cooking apparatus)

Timeline Inc. v. ProClarity Corp. (patent infringement, W.D. Washington; database technology)

Commins Mfg., Inc. v. Simpson Mfg. Co., Inc. (patent infringement, W.D. Washington; construction engineering technology)

Perma-Chink Systems, Inc. adv. Nisus Corp. (patent infringement, E.D. Tenn; chemical formulations for preservation of timber products)

Studio Moderna v. Big Fish Games, Inc. (trademark opposition, TTAB)

Koninklijke Philips Electronics N.V. v. Cardiac Science Operating Co. (appeal from patent interference proceeding pursuant to 35. U.S.C. 146, W.D. WA)

Photon Control, Inc. v. Azbil North America, Inc. (trade secret, N.D. Cal.)

NetVersant Solutions LLC v. INNO4 LLC (trade secret, Snohomish Ct. Sup. Court)

Publications and Speeches

"Software patents survive Supreme Court's Alice decision, but questions linger," West Law Journal, Vol. 31, Issue 3, July 2014 

CASRIP Transnational Intellectual Property Seminar, various patent topics, Dresden, Germany, March 2014; London, England, March 2013;  Alicante, Spain, March 2011; Rome, Italy, March 2009;  Tokyo, Japan, March 2007

Waseda University School of Law, Challenging Patent Validity In The USPTO, Tokyo, Japan, June 2012

Renmin University School of Law, IP Protection in the Information Age, Beijing, China, June 2012

Waseda University School of Law, RCLIP International IP Strategy Seminar, various patent topics, Tokyo, Japan, 2009-2010

Japan Patent Attorneys Association, Claim Construction In United States Patent Litigation, Osaka, Japan, July 2010

Japan Intellectual Property Association, Appeals To The Federal Circuit, Local Rules In Patent Infringement Actions, Tokyo, Japan, July 2010

Osaka Institute of Technology, Patent Protection For Software And Business Method Patents In The United States, Osaka, Japan, June 2009


J.D., magna cum laude, Seattle University School of Law, 2003
M.S., Chemistry (Analytical), University of Washington, 2000
B.S., Chemistry, Honors, University of Florida, 1998

Bar Admissions

U.S. Patent and Trademark Office

Court Admissions

U.S. Court of Appeals for the Federal Circuit
U.S. District Court for the Eastern and Western Districts of Washington


Japan-America Society, Board of Directors, past Secretary


Chambers & Partners, Chambers USA, Washington Intellectual Property, 2015-2016
Globe Business Publishing Ltd, IAM Patent 1000, 2012-2014
Woodward/White, Inc., Best Lawyers, Litigation - Intellectual Property, 2016-2017
Thomson Reuters, Washington Super Lawyers, 2013-2016
Thomson Reuters, Washington Super Lawyers Rising Star, 2007-2012
Research and Technical Editor, Seattle University Law Review
King County Bar Association, IP Section, Past Chair (2011-2012)