the firm's post-grant practitioners are some of the most experienced in the country.


Artificial Intelligence (AI)
Artificial Intelligence (AI)
Digital Health
Digital Health
Energy & Renewables
Energy & Renewables

Fast Facts

About Our

Law Firm

About Our Law Firm

Headquartered within steps of the USPTO with an affiliate office in Tokyo, Oblon is one of the largest law firms in the United States focused exclusively on intellectual property law.

Get to know our


Get to know our History

Norman Oblon with Stanley Fisher and Marvin Spivak launched what was to become Oblon, McClelland, Maier & Neustadt, LLP, one of the nation's leading full-service intellectual property law firms.

Our Local and

Global Reach

Our Local and Global Reach

Outside the US, we service companies based in Japan, France, Germany, Italy, Saudi Arabia, and farther corners of the world. Our culturally aware attorneys speak many languages, including Japanese, French, German, Mandarin, Korean, Russian, Arabic, Farsi, Chinese.

A few of our


A few of our ACCOLADES

Oblon's professionals provide industry-leading IP legal services to many of the world's most admired innovators and brands.




From the minute you walk through our doors, you'll become a valuable part of a team that fosters a culture of innovation, client service and collegiality.

A few ways to

GET In Touch

A few ways to GET In Touch
US Office

Telephone: 703-413-3000
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Tokyo Office

Telephone: +81-3-6212-0550
Learn More +


Patent Forms

Downloadable Patent Forms

The United States Patent and Trademark Office (USPTO) issued final rules implementing the inventor's oath or declaration provisions of the America Invents Act (AIA) on August 14, 2012.

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Mark  Nagumo

Mark Nagumo

Of Counsel
T: (703) 412-1795
F: (703) 413-2220
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Mark Nagumo is a chemical patent attorney in the firm’s Chemical Patent Practice group.  His practice focuses on chemical patent issues, and he consults and offers opinions on a full range of patent issues. 

Prior to joining the firm, Mr. Nagumo spent 29 years at the United States Patent and Trademark Office (USPTO), including 17 years as an Administrative Patent Judge (APJ) at the Patent Trial and Appeal Board (PTAB) (formerly the Board of Patent Appeals and Interferences (BPAI)), three years as an Associate Solicitor, and seven years as an Examiner (three years as a Primary Examiner).  As an Administrative Patent Judge and as an Associate Solicitor, he handled appeals to the patent Board, and to the Court of Appeals for the Federal Circuit, respectively, throughout the chemical technologies, as well as cases in mechanical and electrical areas.  As an Examiner, Mr. Nagumo focused on high polymers, metallocene and metathesis polymerization catalysts, and polymers having unusual properties and applications, including nonlinear optical properties, and liquid crystal polymers.  Before joining the Patent Office, Mr. Nagumo was a research chemist at the Naval Research Laboratory (Washington, D.C.) for about seven years, starting in the Optical Sciences Division and ending in the Bio/Molecular Engineering Branch of the Chemical Division. 

Mr. Nagumo’s practical experience in chemical research, especially using optical spectroscopies to study biomolecules and other materials, as well as a wide range of other analytical techniques, provide him with a solid basis for analyzing issues of patentability throughout chemical and materials technologies.  


  • George Mason University (J.D.)
  • University of California
    •  Physical Chemistry (Ph.D.)
  • Princeton University
    • Chemistry, A.B.


  • Virginia
  • U.S. Patent and Trademark Office


S.G. Kunin, M. Nagumo, B. Stanton, L.S. Therkorn, and S. Walsh, 51 Am. Univ. L. Rev. 609–638 (2002)  “Reach-Through Claims in the Age of Biotechnology”