Litigation - Intellectual Property Patent Law
John D. Denkenberger
Recognized in Best Lawyers since 2011 Awarded Practice Areas
Biography
John Denkenberger is the managing member of COJK, a member of the firm's executive committee, and chair of the litigation practice group. John has successfully litigated patent, trademark, trade secret, and unfair business competition issues in federal and state courts. He has also successfully litigated AIA post-grant challenges, including inter partes review, before the Patent Trial and Appeal Board. In addition to his litigation practice, John also advises clients on foreign and domestic patent and trademark procurement, technology licensing, and litigation strategies in a variety of technology areas, including mechanical, electromechanical, acoustics, and software. Prior to becoming an attorney, John worked for 10 years as a research and design engineer in the aerospace and aircraft industry.
Since its inception in 2013, John has been named to Intellectual Asset Management's Patent 1000 — The World's Leading Patent Professionals. He is ranked in Chambers USA for intellectual property law; is recognized in Managing Intellectual Property magazine’s IP Stars for his work in patent law; is included in the list of The Best Lawyers in America; and has been named a Washington Super Lawyer.
Overview
- State University of New York at Buffalo, B.S., Mechanical Engineering, graduated 1986
- Seattle University, J.D., cum laude, graduated 1995
- Washington, Washington State Bar
- American Bar Association - Member
- American Intellectual Property Law Association - Member
- Asian Bar Association of Washington - Member
- King County Bar Association - Member
- Patent Trial and Appeal Board Bar Association - Member
- Washington State Patent Law Association - Member
- Supreme Court of the United States
- U.S. Court of Appeals for the Federal Circuit
- U.S. Court of Appeals for the Ninth Circuit
- U.S. District Court for the District of Colorado
- U.S. District Court for the Eastern District of Texas
- U.S. District Court for the Western District of Washington
- Washington, Washington State Bar
- American Bar Association - Member
- American Intellectual Property Law Association - Member
- Asian Bar Association of Washington - Member
- King County Bar Association - Member
- Patent Trial and Appeal Board Bar Association - Member
- Washington State Patent Law Association - Member
- State University of New York at Buffalo, B.S., Mechanical Engineering, graduated 1986
- Seattle University, J.D., cum laude, graduated 1995
- Supreme Court of the United States
- U.S. Court of Appeals for the Federal Circuit
- U.S. Court of Appeals for the Ninth Circuit
- U.S. District Court for the District of Colorado
- U.S. District Court for the Eastern District of Texas
- U.S. District Court for the Western District of Washington
Client Testimonials
Awards & Focus
Recognized in The Best Lawyers in America® 2026 for work in:
- Litigation - Intellectual Property
- Patent Law
Additional Areas of Practice:
- Litigation - Patent
Awards:
- Chambers USA
- Intellectual Asset Management, IAM Patent 1000 - The World's Leading Patent Professionals
- Managing Intellectual Property, IP Stars
- Super Lawyers, Washington
News & Media
Case History
Cases
- MercAsia USA, Ltd. v. Jianqing “Johnny” Zhu and 3BTech, Inc.
U.S. District Court for the Northern District of Indiana Representing MercAsia USA, Ltd. in enforcing patent rights and to obtain preliminary injunction related to consumer products.
- Northwestern University v. King County
U.S. District Court for the Western District of Washington Represented defendant against allegations of unfair and deceptive trade practices and trademark infringement under federal, state, and common law.
- Data Management Association International v. Enterprise Warehousing Solutions, Inc.
U.S. District Court in Chicago Represented plaintiff in matter alleging trademark infringement and unfair business competition.
- Shinn Fu Company of America, Inc. et al. v. Alltrade Tools LLC
U.S. District Court for the Central District of California Represented plaintiffs Shinn Fu Company of America, Inc. and Shinn Fu Corporation to enforce patent rights and to obtain declaratory judgments concerning defendant’s intellectual property.
- Bombardier Inc. v. Mitsubishi Aircraft Corporation et al
U.S. District Court for the Western District of Washington Represented plaintiff Bombardier, Inc. in a complaint alleging among other claims, trade secret misappropriation under federal and state law.
- wedi Corp. v. Wright et al.
U.S. District Court for the Western District of Washington Represented defendant Hydro-Blok USA LLC, et al. against complaint of various causes of action, including unjust enrichment based on misappropriation of trade secrets.
- Hydro-Blok USA LLC, et al. v. wedi Corp.
U.S. District Court for the Western District of Washington Represented Hydro-Blok USA LLC, et al. in patent infringement matter related to prefabricated shower systems.
- wedi Corp. v. Seattle Glass Block, Inc.
U.S. District Court for the Western District of Washington Represented defendant Seattle Glass Block, Inc. against a complaint for various causes of action, including breach of contract, breach of fiduciary duty, fraud, and misappropriation of trade secrets.
- The Tire Hanger Corporation v. Shinn Fu Company of America, Inc., et al
U.S. District Court for the Central District of California Represented defendants Shinn Fu Company of America, Inc. and Shinn Fu Corporation against complaint for allegations of patent infringement.
- 3BTech, Inc. v. Jingle Master International Ltd. (IPR2018-00663)
Patent Trial and Appeal Board Represented patent owner Jingle Master International Ltd. in an inter partes review proceeding for a certain claim of US Patent No. 7,882,986 related to liquid dispensing devices.
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