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Cherylyn Esoy Mizzo



Cherylyn Esoy Mizzo is a Principal in the Washington, D.C. office of Fish & Richardson. Her practice emphasizes complex patent and intellectual property litigation before the International Trade Commission and federal district courts. Ms. Mizzo clerked for the Honorable Alan D. Lourie, Circuit Judge of the United States Court of Appeals for the Federal Circuit (2006-2008) and for the Honorable Garrett E. Brown, Jr., Chief Judge of the United States District Court for the District of New Jersey (2004-2006). She was also a Judicial Intern for the Honorable Joseph A. Greenaway, Jr., then District Judge of the United States District Court for the District of New Jersey (2001-2001). Prior to law school, Ms. Mizzo was a Scientist with Roche Molecular Systems where she worked on developing automated clinical diagnostic instruments for the amplification and detection of HIV and HCV (1997-2000).

As a practicing attorney and as a law clerk, Ms. Mizzo has worked on numerous cases involving a wide range of technologies, including pharmaceuticals (such as anti-hypertensive, anti-cancer, anti-glaucoma and anti-platelet aggregating medications), biomedical devices, recombinant DNA technology, DRAM chips, semiconductors, inkjet ink cartridges, and asymmetric digital subscriber line (DSL) modems.

Ms. Mizzo is also committed to serving the legal needs of individuals and non-profit organizations by representing clients on a pro bono basis. Ms. Mizzo recently represented a transgender woman from El Salvador who fled her country after being persecuted on account of her sexual identity. Ms. Mizzo successfully assisted her client in applying for and ultimately obtaining political asylum.


  • New Jersey
  • New York 2004
  • District of Columbia 2009
  • United States Patent and Trademark Office 2013
  • United States District Court for the District of New Jersey
  • United States Court of Appeals for the Third Circuit
  • United States Court of Appeals for the Federal Circuit


  • The Honorable Alan D. Lourie, United States Court of Appeals for the Federal Circuit, 2006 - 2008
  • The Honorable Garrett E. Brown, United States District Court for the District of New Jersey, 2004 - 2006

Memberships and Affiliations

Advisory Board Member, Gibbons Institute of Law, Science & Technology.

Other Distinctions

Cherylyn is a regular contributor to Fish's Litigation Blog and her posts can be read here.

"Adjusting the life of a US patent due to Patent Office delay," Cherylyn Esoy Mizzo, Jack Brennan, John B. Pegram, Industrial Biotechnology (February 2010), 6(1): 18-21.

"Revisiting Ariad v. Eli Lilly," Brian Coggio and Cherylyn Esoy Mizzo, IP Law360 (August 10, 2009).

"The PTO's 2001 Revised Utility Examination Guidelines for Gene Patent Applications: Has the PTO Exceeded the Scope of Authority Delineated by the Court's Interpretation of a 'Useful' Invention?" 33 Seton Hall L. Rev, 127 (2002).

Panelist, "Open Forum: Ask the Judges About Patent Litigation," American Law Institute/American Bar Association, Trial of a Patent Case, Chicago, Illinois (September 2005).


  • BA, Rutgers University 1997
    Molecular Biology, Biochemistry, History
    Phi Alpha Theta
  • JD, Seton Hall University Law School 2003
    magna cum laude, Order of the Coif
    Articles Editor, Seton Hall Law Review