Douglas L.Clark (Doug)


San Diego + 1.858.703.3133

Doug Clark is involved in all aspects of civil litigation, with a strong focus on intellectual property litigation (including patents, trade secrets, copyrights, and trademarks). During his career he has brokered and facilitated the favorable settlements in several dozen matters.

Doug has successfully argued before the Patent Trial and Appeal Board (PTAB) resulting in the invalidation of an opponent's patent. He won an arbitration regarding a contractual matter and an International Trade Commission (ITC) trial regarding vape pens. He has represented clients in diverse technology categories, including semiconductors, cell phones, digital content processing, MMS/SMS (multimedia messaging services/short message service), wireless communications, memory card readers, thumb drives, solar power, wire design, aircraft fire inerting systems, pharmaceutical cancer drugs, gene therapy, bovine vaccines, baby products, truck aerodynamics, exercise equipment, and aircraft seating.

Prior to joining Jones Day, Doug was a submarine officer in the U.S. Navy where he completed the Navy's rigorous nuclear power program and qualified as a nuclear engineer. During his naval career, he addressed NATO allies at a NATO Submarine Conference in Portsmouth, England regarding submarine information sharing and connectivity; acted as a U.S. liaison officer with the Swedish Submarine Force to coordinate the first ever public visit of a Swedish submarine to the Mediterranean; and managed divisions of up to 45 men while on board the USS Columbus out of Pearl Harbor, Hawaii.

Doug is co-president of the Tom Homann LGBTQ+ Law Association, director/treasurer of SDIPLA (San Diego Intellectual Property Law Association), member of SDCBA (San Diego County Bar Association), former president of OCIPLA (Orange County Intellectual Property Law Association), and former director of OCLBA (Orange County Lavender Bar Association).


  • R.J. Reynolds successfully enforces patents in ITC trial against Philip Morris in dispute over cigarette alternativeJones Day's client Reynolds achieved a precedent-setting victory before the International Trade Commission (ITC) against its main competitors Philip Morris Products S.A. ("Philip Morris") and Altria Client Services LLC ("Altria") in a patent infringement dispute involving tobacco heating and vaping products.
  • Micron Technology asserts trade secret and RICO claims, establishes U.S. jurisdiction over foreign defendants under DTSAJones Day represents Micron Technology, Inc. as a plaintiff in a trade secret and RICO lawsuit against Taiwanese and Chinese entities accused of theft of Micron's semiconductor processing technology.
  • Japanese wire manufacturer and its U.S. subsidiary defend against alleged patent infringement regarding wire technologyJones Day secured a final judgment of non-infringement and invalidity in favor of a Japanese wire manufacturer and its U.S. subsidiary in a patent infringement case related to coil wire technology in the Central District of California.
  • Experian wins partial summary judgmentJones Day won partial summary judgment for Experian Information Solutions, Inc. in an action alleging violations of the Fair Credit Reporting Act, 15 U.S.C. Section 1681 et seq., and the California Consumer Credit Reporting Agencies Act, Cal. Civ. Code Section 1785.1 et seq.
  • Ridge defends against competitor's allegations of infringementJones Day is defending Ridge Corporation against allegations that the company infringes five patents directed to aerodynamic drag reducing devices used in the trucking industry.
  • Wonderland Nurserygoods asserts patent against competitorJones Day represents plaintiff Wonderland Nurserygoods Co., Ltd., one of the world's largest designers and manufacturers of baby products, in a patent infringement case against Baby Trend, Inc., and its officers over Wonderland's patent related to baby play yards.
  • The Nielsen Company obtains preliminary injunctionJones Day obtained a preliminary injunction for The Nielsen Company (US), LLC, NeuroFocus, Inc., and TNC (US) Holdings, Inc. (collectively "The Nielsen Company") against the former chief executive officer of a Nielsen entity.
  • Jones Day achieves a settlement for pro bono client in an unlawful detainer actionIrvine associates Doug Clark, Brianne Jackson, and two summer associates achieved a favorable settlement for their pro bono client in an unlawful detainer action that was set for trial in Orange County Superior Court on July 21, six days after Jones Day was retained.
  • Episil Technologies and Hermes-Epitek obtain dismissal of trade secret litigationJones Day handled this international trade secret misappropriation dispute on behalf of Taiwanese semiconductor foundry Episil Technologies Inc. and equipment supplier Hermes-Epitek Corporation.
  • Celgene obtains dismissal with prejudice of patent infringement claims involving its Vidaza® brand drugJones Day represented Celgene Corporation in a patent infringement lawsuit involving the company’s Vidaza® brand drug that was filed by IVAX LLC in the Southern District of Florida.
  • Micron Technology and Lexar Media successfully resolve ITC patent disputeJones Day successfully represented Micron Technology, Inc. and Lexar Media, Inc. as U.S. respondents in a patent infringement investigation.
  • Wonderland Nurserygoods pursues patent infringement claims against Baby Trend involving baby car seats and strollersJones Day represents plaintiff Wonderland Nurserygoods Co., Ltd. in asserting its patent rights against Baby Trend, Inc.'s baby car seats and strollers.
  • Speaking Engagements

    • January 10, 2022
      Exchange on Equity Roundtable: Leading as Community
    • October 28, 2021
      Tom Homann LGBTQ+ Annual Dinner — President's speech
    • June 2, 2021
      Podcast, Time to Meet & Confer! (E16) - Recognizing the Tom Homann LGBT Law Association
    • January 18, 2017
      IP Year in Review
    • February 26, 2015
      Hot Topics in IP Law and How to Get Hired, Western State University College of Law
    • May 16, 2013
      Design Patents in Light of Apple v. Samsung, Orange County Patent Law Association
    • November 28, 2011
      Intellectual Property Career Paths and the Job Market, panelist, Western State University College of Law