S. Christian Platt

Partner

San Diego + 1.858.314.1156 Silicon Valley + 1.650.687.4175

Contact

Partager

As a veteran trial lawyer, Christian Platt represents leading innovators in cases involving patent infringement and validity, trade secrets, and licensing, successfully resolving complex disputes in the courts, arbitral tribunals, and the U.S. Patent Office. He has tried more than a dozen matters to verdict or award across jury trials, bench trials, and arbitrations. The Daily Journal recognized him for a "Top Defense Result" of the year following a three‑week jury trial that resulted in a verdict of noninfringement.

Christian has extensive experience handling life sciences disputes relating to gene therapy, cell therapy, gene editing, antibodies, plasmids, cell lines, proteomics, liquid biopsy, vaccines, pharmaceuticals, and transgenic animal models. He also handles matters involving other technologies, including telecommunications, electronics, software, networking, and medical devices such as noninvasive patient monitoring.

Clients and peers recognize his practical insights. The Legal 500 US described him as "very professional" and someone who "does a great job presenting a case." Christian has written and spoken extensively on litigation strategy and patent damages, including authoring a chapter in Life Sciences Client Strategies (Aspatore). He regularly presents to in‑house counsel and industry groups — such as the ABA — on topics ranging from trial strategy to the evolving law on the safe harbor exemption and damages.

He serves on the Council for the American Bar Association Intellectual Property Law Section and on the Board of Governors of the Association of Business Trial Lawyers.

Christian is the administrative partner for the San Diego Office.

Expérience

  • REGENXBIO resolves patent dispute with Aldevron over patented host cells used in gene therapy applicationsJones Day represented plaintiff REGENXBIO Inc. in a patent infringement case brought against Aldevron LLC claiming that without authorization, Aldevron used and manufactured cultured host cells containing recombinant nucleic acid molecules with sequences encoding AAV8 capsid protein(s) and a heterologous non-AAV sequence.
  • Kyowa Hakko Kirin and BioWa successfully enforce patent rights on antibody technologyJones Day, on behalf of Japanese life sciences company Kyowa Hakko Kirin Company, Limited ("KHK") and its wholly-owned U.S. subsidiary, BioWa, successfully settled a patent infringement suit over three of KHK's patents that underlie KHK's award-winning POTELLIGENT® technology capable of producing therapeutic antibodies with dramatically improved potency and efficacy.
  • Kyowa Hakko Kirin defeats competitors in Patent Trial and Appeal Board challenge of patents on antibody technologyOn October 23, 2017, the Patent Trial and Appeal Board ("PTAB") issued a trio of decisions, unanimously declining to institute inter partes review ("IPR") of three patents owned by a Japanese pharmaceutical company represented by Jones Day, Kyowa Hakko Kirin Co., Ltd.
  • REGENXBIO successfully blocks institution of post-grant review of gene therapy patentJones Day successfully defended REGENXBIO, Inc. against a post-grant review (PGR) petition filed by Passage Bio before the U.S. Patent Trial and Appeal Board (PTAB) against one of REGENXBIO's AAV9 patents.
  • SOLiD defeats patent infringement claims in U.S., UK, and Germany over DAS equipment for 5G technologyJones Day successfully represented SOLiD, Inc. in multi-jurisdictional patent litigation proceedings brought by a competitor who alleged that client's leading Distributed Antenna System ("DAS") solutions infringe claims of six patents (two European and four U.S.).
  • AbbVie successfully defends HUMIRA® formulation patent against four IPR petitions filed by CoherusJones Day served as lead counsel and successfully defended AbbVie in connection with four (4) separate inter partes review (IPR) petitions brought by Coherus Biosciences, Inc. against U.S. Patent No. 9,085,619, which is related to formulations for AbbVie's antibody adalimumab, marketed as HUMIRA®.
  • St. Jude and Juno secure $12.25 million settlement resolving patent dispute with Novartis Pharmaceuticals and University of PennsylvaniaJones Day represented St. Jude Children's Research Hospital ("St. Jude") in enforcing breach of contract claims and defending patent invalidity claims against the University of Pennsylvania ("Penn") and Novartis Pharmaceuticals ("Novartis").
  • CJ CheilJedang defends German patent infringement action by Japanese competitorJones Day represented CJ CheilJedang Corporation, a major Korean-based multinational company, in an international patent dispute with a Japanese competitor before the courts in Germany, including the Federal Supreme Court of Germany.
  • Allergan defends JUVEDERM® patents against nine IPR petitions filed by ProlleniumJones Day is representing Allergan, Inc. before the U.S. Patent Trial and Appeal Board ("PTAB") on nine IPR petitions filed by Prollenium challenging multiple patents covering certain of Allergan's JUVEDERM® products, hyaluronic acid-based dermal fillers that include the anesthetic lidocaine.
  • PI Advanced Materials obtains CAFC affirmance of summary judgment win in patent case regarding polyimide filmsJones Day successfully obtained a Federal Circuit affirmance of a summary judgment win of non-infringement on behalf of PI Advanced Materials Co., Ltd. ("PIAM", formerly SKC Kolon PI, Inc. ("SKPI")).
  • SOLiD and Reach obtain jury verdict finding non-infringement in competitor-vs.-competitor patent caseFollowing a seven day trial, a jury in the Northern District of California unanimously found that Jones Day clients SOLiD, Inc. and Reach Holdings LLC did not infringe any claims of a 16-year-old wireless communications patent owned by Corning Optical Communications Wireless Ltd., a subsidiary of Corning, Inc.
  • Qualcomm resolves worldwide Chinese litigationJones Day represented Qualcomm Incorporated as complainant in an ITC action against a Chinese phone manufacturer and several distributors asserting five patents concerning radio frequency transceivers, device structures, packaging, structures, and camera phone operation.
  • CORSAIR® acquires SCUF Gaming®Jones Day advised CORSAIR® in connection with the acquisition and related financing of high-performance controller pioneer SCUF Gaming "SCUF®" and its extensive patent portfolio.
  • 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.
  • Kakao obtains dismissal of patent infringement action relating to teleconferencing technologyAfter filing a motion to dismiss for lack of personal jurisdiction for Korea-based Kakao Corporation in a patent infringement action involving two patents relating to teleconferencing technology, Jones Day obtained dismissal of the action with prejudice.
  • Kakao patent infringement action relating to voice messaging technology successfully dismissedJones Day successfully defended Kakao Corporation in a patent infringement action involving five patents relating to voice messaging technology.
    •

    OCTOBER 2025 Commentary

    Federal Circuit Clarifies Limits on Patentability of Clinical Study Results-Based Applications

    June 2025 Blog

    Applying Fintiv to a Parallel ITC Investigation, PTAB Litigation Blog

    December 2024 Blog

    USPTO Finalizes Partial Permanence of MTA Pilot Program, PTAB Litigation Blog

    July 2024 Alert

    USPTO Requests Comments on the Experimental Use Exception

    May 2024 Commentary

    Canadian Drug Importation May Undermine Intellectual Property Protection

    December 2020 Blog

    PTAB Touts Soaring MTA Pilot Program, PTAB Litigation Blog

    October 2019 Blog

    PTAB Proposes Burden of Persuasion Rules for AIA Amendments, PTAB Litigation Blog

    February 2019 Blog

    No PTAB Do Over: After SAS Remand, PTAB Denies All Grounds, PTAB Litigation Blog

    February 2019 Blog

    E-Trading Patents Are "For Technological Inventions," Not Subject To CBM Review, PTAB Litigation Blog

    February 2019 Commentary

    Supernus: Federal Circuit Provides Clarity on USPTO Discretion on Patent-Term Adjustment Calculations
    Voir toutes les publications

    Autres publications

    • August 3, 2025
      Two Week Deadline for PTAB to Issue Notice of Filing Date Accorded, PTAB Litigation Blog
    • December 3, 2015
      Apportionment of Lost Profits Damages Appears To Be Making a Comeback, Intellectual Property Strategist

    Publications Prior to Jones Day

    August 13, 2013

    Recent Trends and Approaches in Calculating Patent Damages: Nash Bargaining Solution and Conjoint Surveys, Patent, Trademark & Copyright Journal (BNA)

    September 20, 2011

    Obtaining Preliminary Injunctions in Open-Source Cases, Intellectual Property Litigation, American Bar Association Section of Litigation: Intellectual Property

    February 2, 2011

    Subject Matter Patentability and the Biotech Industry, AIPLA Mid-Winter Institute

    June 1, 2011

    Proving Patent Damages after Uniloc, Proof, American Bar Association Trial Evidence Committee

    April 30, 2010

    The Rise and Fall of Patent Marking Suits, Patent, Trademark & Copyright Journal (BNA)

    August 31, 2009

    Preparing for and Defending Against Claims of Corporate Officer Personal Liability for Patent Infringement, Bloomberg Law Reports

    December 15, 2008

    In-House Open Source Compliance Programs Should Be Considered in Wake of Jacobsen decision, Bloomberg Intellectual Property Law Report

    January 31, 2008

    Recently Renewed Patent Reform Act’s Impact on Medical Device Industry, San Diego Daily Transcript

    2008

    Inside the Minds: Life Sciences Client Strategies, Aspatore Books

    2007

    The Great Unknown: Advice for New Law Firm Partners, The Recorder

    Winter 2007

    Beware Foreign Defendants: You May Be Liable For Patent Infringement Even Without Conducting Any Business in the United States, New Matter, State Bar of California

    December 8, 2006

    Doubting the Obvious, Los Angeles Daily Journal

    October 2006

    Choosing Your Turf: A Brief Overview of Venue in Patent Cases, Intellectual Property Today

    • September 11, 2025
      More the Merrier? Navigating an Inclusive Joint Inventorship Standard in Collaborative R&D Settings - Private Client CLE
    • October 15, 2024
      Recent Developments in Research Use Exemptions to Patent Infringement in the United States, Europe, and Other Major Jurisdictions - Private Client CLE
    • April 13, 2021
      Navigating Patent Damages, 2021 American Bar Association Intellectual Property Law Spring Meeting
    • January 28, 2016
      Winning Strategies for Litigating Patent Trials, Northern California Jones Day University
    • February 25, 2015
      Practical Strategies for Addressing the Evolving Patent-Damages Landscape, Federal Bar Association
    • January 15, 2015
      2014 Patent Law Year in Review (and a Look Ahead at 2015)
    • September 30, 2014
      Winning Trial Techniques for the Complex Patent Litigator, 2014 Patent Disputes Forum
    • September 26, 2014
      IP Enforcement in the US: the Jury Trial, Asia Intellectual Property Finance and Business Conference
    • September 22, 2014
      Deposition and Trial Strategies for Witnesses in United States Lawsuits, In-House Counsel Forum

    Speaking Engagements Prior to Jones Day

    October 24, 2013

    Recent Developments regarding Patent Damages, Patent Litigation Committee, AIPLA Annual Meeting

    Washington, D.C.

    April 3, 2013

    How to Prove Damages in Patent, Trademark and Copyright Cases, The Knowledge Conference 

    Webinar

    February 2, 2011

    Subject Matter Patentability and the Biotech Industry, AIPLA Mid-Winter Institute

    Orlando, Florida

    2008

    In-House Open Source Compliance Programs, ACC Roundtable CLE, Association of Corporate Counsel

    San Diego, California

    2006

    How New Patent Rules Make San Diego a More Attractive Patent Litigation Forum for Biotechnology Companies, ACC Roundtable CLE, Association Of Corporate Counsel

    San Diego, California

    2005

    Practical Tips on Enforcing and Defending Patents, American Bar Association Intellectual Property Section Annual Meeting

    San Francisco, California

    2003

    Discovery of Patent Prosecution Documents, American Bar Association Intellectual Property Law Annual Meeting

    Washington, D.C.

    2002

    Effect of Federal Circuit and Supreme Court’s Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co., Ltd. Opinions, CLE Presentation

    Palo Alto, California

    Avant d’envoyer cet e-mail, veuillez prendre note de ce qui suit :

    Les informations contenues sur le site www.jonesday.com sont destinées à un usage général et ne constituent pas des conseils juridiques. L’envoi et la réception de cet e-mail n’ont pas pour effet de créer une relation avocat-client. Aucun envoi de votre part à un membre du Cabinet ne sera traité comme confidentiel ou protégé à moins que nous n’ayons donné notre accord pour vous représenter. En envoyant cet e-mail, vous confirmez avoir lu et compris la présente notification.