Alex K.Chung Ph.D.


Washington + 1.202.879.3857

Alex Chung's practice involves a mix of patent prosecution, counseling, and litigation in the areas of biotechnology and pharmaceuticals. He has extensive experience in procuring, managing, evaluating, enforcing, and defending patents and in providing strategic IP counsel to clients. Alex's practice includes the preparation and prosecution of patent applications, providing patentability, infringement, validity, and freedom-to-operate opinions, and conducting due diligence analysis on IP portfolios.

Prior to joining Jones Day in 2017, Alex successfully represented clients in patent infringement and Hatch-Waxman actions involving biotechnology and pharmaceutical patents in district courts and the United States International Trade Commission (ITC). He also has in-depth experience with inter partes review (IPR) proceedings before the Patent Trial and Appeal Board (PTAB). Alex has extensively represented U.S., European, Korean, and Japanese companies in the biotechnology and pharmaceutical industries.

Prior to attending law school, Alex worked as a postdoctoral fellow at the National Institutes of Health (NIH), where he investigated photoreceptor differentiation and designed switchable adeno-associated virus (AAV) gene therapy vectors for clinical trials. He is a co-inventor of a U.S. patent on RNA interference (RNAi) expression vector, which was commercially licensed to and is currently marketed by Thermo Fisher (f.k.a. Invitrogen).

Alex is a native speaker of Korean and regularly travels to Korea to visit clients.


Ajinomoto Co., Inc.

Certain L-Tryptophan, L-Tryptophan Products, and Their Methods of Production (Inv. No. 337-TA-1005).

AstraZeneca LP

AstraZeneca LP et al v. Sigmapharm Laboratories, LLC, et al. (1:15-cv-01000-RGA; D. Del).

GeneDx Inc. (BioReference Laboratories, Inc.)

Univ. of Utah Research Found. v. GeneDx, Inc. (2:13-cv-00954-RJS; D. Utah).

  • ToolGen seeks patent protection for CRISPR technologyJones Day is prosecuting patent applications and developing a patent portfolio on behalf of ToolGen, Inc. for CRISPR technology.
  • Represents experience prior to joining Jones Day.

    Additional Publications

    • March 2018
      Incorporation by Reference Users Beware, PTAB Litigation Blog

    May 2016

    PTO designates new precedential opinions on additional discovery, one-year time bar, substitute claims, and interpretation of § 312(a)(2), Finnegan AIA Blog

    Patent Owner’s Particular Fax Qualified as Invalidating Offer for Sale of Drug Despite Omission of Safety and Liability Terms, Finnegan Federal Circuit IP Blog

    March 2016

    PTAB’s institution decision, even if based on a subset of grounds, is still unreviewable, Finnegan AIA Blog

    District Court: IPR Estoppel Does Not Exclude Cumulative Prior Art Not Reasonably Available in a Prior IPR Proceeding, Finnegan AIA Blog

    August 2015

    Direct infringement expands: Limelight’s and customers’ split performance of method infringes Akamai’s patent, Finnegan Federal Circuit IP Blog

    July 2015

    Teva’s “molecular weight” patent claims found indefinite, Finnegan Federal Circuit IP Blog

    A Federal Circuit split saves broadest reasonable interpretation standard at PTAB, Finnegan Federal Circuit IP Blog

    June 2015

    Sequenom’s fetal DNA Diagnostic method not patent eligible subject matter, Finnegan Federal Circuit IP Blog

    March 2014

    The Patent Landscape of siRNA Nanoparticle Delivery, Nanotechnology Law & Business. 11:15-28.


    April 2009

    MicroRNA-based RNA Polymerase II Expression Vector for RNA Interference in Mammalian Cells, In Regulation of Gene Expression by Small RNAs. Eds. Gaur, R.K., Rossi, J.J. CRC Press, 301-315.

    December 2008

    Scaffold Protein POSH Regulates Axon Outgrowth, Molecular Biology of the Cell, 19:5181-5192.

    August 2008

    MiR-124a Regulates Neurite Outgrowth during Neuronal Differentiation, Experimental Cell Research, 314:2618-2633.

    September 2006

    Detection of mammalian microRNA expression by in situ hybridization with RNA oligonucleotides, Developmental Dynamics, 235: 2538-48.

    April 2006

    Polycistronic RNA Polymerase II Expression Vectors for RNA Interference Based on BIC/miR-155, Nucleic Acids Research, 34:e53.