Andrew Liddell

Special Counsel

  • Andrew Liddell
  • Phone: +1 512 277 2272

    Import to Address Book

  • Duane Morris LLP
    Terrace 7
    2801 Via Fortuna, Suite 200
    Austin, TX 78746-7567

W. Andrew Liddell practices in the area of intellectual property law, with a particular emphasis on patent litigation in federal court and inter partes review proceedings before the Patent Trial and Appeal Board of the United States Patent and Trademark Office, as well as in trade secret and trademark disputes. As an advocate and litigator, he has particular experience in evaluating patent and trade secret damages, which can inform the business case for litigation and can drive the successful resolution of disputes.

Mr. Liddell was named a Super Lawyers Texas Rising Star for five consecutive years before, in 2019, he joined a media technology company he cofounded. He brings a unique perspective to his representation of client needs because he served as the CEO and head of legal for an early-stage technology company, which required business-first strategic decision-making to deliver impressive results on a modest budget.

Mr. Liddell has experience litigating disputes and managing IP portfolios for well-known clients in the following domains:

  • Computer technology, including software-as-a-service, semiconductors, and wireless communications, and geolocation
  • Consumer products, including consumer packaged goods, pet products, and outdoor power equipment
  • Medical devices, including joint replacements, wound therapy devices, and pelvic implants
  • Oilfield technology, including deepwater drilling platforms, hydraulic fracturing tools, and frac sand transportation and storage
  • Construction technology, including movable stadium roofs
  • Diagnostic technology, including bioassays, flow cytometry, and microfluidics

Mr. Liddell is an active member of the Hon. Lee Yeakel IP Inn of Court, a member of the American Intellectual Property Law Association and the Intellectual Property Owners Association, and a member of the Texas Bar Foundation.

Mr. Liddell is a 2009 graduate, with honors, of the University of Texas School of Law and a 2006 graduate, with high honors, of Texas A&M University.

Areas of Practice

  • Intellectual Property Law

  • Patents


  • Texas
  • U.S. District Court for the Northern District of Texas
  • U.S. Patent and Trademark Office (USPTO)


  • University of Texas School of Law, J.D., with honors, 2009
  • Texas A&M University, B.S.M.E., with high honors, 2006


  • Duane Morris LLP
    - Special Counsel, 2021-present
  • Ellodee Inc.
    - Founder, CEO and Head of Legal, 2018-2021
  • Norton Rose Fulbright
    - Senior Associate/Associate, 2009-2019

Professional Activities

  • Hon. Lee Yeakel IP Inn of Court

  • Texas Bar Foundation

Selected Publications

  • Author, "Seagate washes up: enhanced damages after Halo," Thought Leadership, June 13, 2016
  • Co-author, "New PTAB Rules Take Effect May 2, 2016," Patent Challenges, April 28, 2016
  • Author, "Federal Circuit rules that PTAB has full discretion to deny request to file motion for supplemental information," Patent Challenges, March 8, 2016
  • Author, "Federal Circuit holds that PTAB is not bound by findings made in Institution Decision," Patent Challenges, February 12, 2016
  • Author, "Federal Circuit rules it has no interlocutory jurisdiction on denial of motion to stay until CBM Review is instituted," Patent Challenges, May 5, 2015
  • Author, "An emerging norm: no stay until PTAB grants IPR petition," Patent Challenges, March 27, 2015
  • Author, "Using Design Patents to Bridge the Gap in a Package Redesign," The Brand Protection Blog, September 23, 2012
  • Author, "UPDATE | Reps Propose “Loser Pays” for Long-Shot Patent Suits," The Brand Protection Blog, September 4, 2012
  • Author, "EU’s Highest Court Allows Extended Patent Protection for New Medical Uses of Known Products," The Brand Protection Blog, August 14, 2012
  • Author, "Reps Propose “Loser Pays” for Long-Shot Patent Suits," The Brand Protection Blog, August 12, 2012
  • Author, "Trending Topic: Twitter's 'Innovator's Patent Agreement'," Law360, May 15, 2012

Selected Speaking Engagements

  • Interviewer, "The Shadow Docket - A Conversation with Professor Steve Vladeck," University of Texas Law School, December 14, 2023
  • Speaker, "Legal Boot Camp: Electric Vehicles and Beyond," Duane Morris Webinar, July 12, 2023

Representative Matters

  • Secured a walk-away dismissal with prejudice in an eight-patent lawsuit that was pending for over three years, wherein the client maintained that it did not infringe the asserted claims and that the patents were invalid and directed to ineligible subject matter, and insisted on fighting the infringement allegations rather than pay an outrageously high settlement demand. The plaintiff ultimately agreed to dismiss, with no money changing hands.

  • Represented client in multi-patent litigation regarding structural foundations for clean energy.

  • Defending a leading security software developer in a patent litigation concerning cybersecurity patents in the Western District of Texas. 

  • ConforMIS, Inc., v. Wright Medical Technology, Inc. (D. Mass.). Assisted in the representation of defendant Wright Medical against alleged infringement of four patents directed to personalized surgical tools and procedures.

  • Lead counsel for a leading security software developer in a patent dispute concerning malware detection technology before the U.S. District Court for the Western District of Texas.

  • TruSun Technologies et al. v. Eaton et al., 6:19-cv-00656-ADA (W.D.Tex) (representing TruSun)