Christopher R. O'Brien



Christopher O'Brien focuses his practice on complex intellectual property matters for a wide range of clients, including those in the fields of semiconductor fabrication, microprocessors, light emitting diodes, medical devices, wireless communications, computer hardware and software and technology startups. Mr. O'Brien's practice encompasses many aspects of intellectual property law, including patent litigation, post-grant proceedings, patent prosecution, due diligence and counseling.

Mr. O'Brien's litigation experience includes actions in district court, involving technologies such as microprocessors, light emitting diodes and printing. He has also represented clients in post-grant proceedings before the USPTO, including inter partes reexamination.

In Mr. O'Brien's patent prosecution practice, he has researched and drafted patent applications, managed a large docket of pending patent applications, and obtained numerous granted patents on behalf of his clients. Additionally, he has counseled and advised clients and foreign associates on claim drafting, interpretation, appeal procedures and reissue applications. Mr. O'Brien has also drafted invalidity opinions, responses to Office actions, and advised clients on issues regarding domestic patent prosecution.

Mr. O'Brien has provided pro bono services through the National Veterans Legal Services Program as well as the DC Bar Association.

Prior to joining WilmerHale, Mr. O'Brien was an associate at a law firm in Alexandria, Virginia. He was also a student associate at the Brooklyn Law Incubator and Policy Clinic, and a legal intern and summer associate at a law firm in New York, New York.

Publications & News


June 23, 2014

Four Important Strategic Consideration for Inter Partes Review Proceedings

An article by David Cavanaugh, Michael Twomey, Vic Souto, Christopher O'Brien, Heather Schafroth and Michael Smith, published in the May/June 2014 edition of IP Litigator, Vol. 20, No. 3.

March 7, 2014

An Eye on Post-Grant Patent Proceedings

WilmerHale’s Post-Grant Patent Proceedings Group actively shares insights on inter partes review, post-grant review, ex parte reexamination and covered business methods.

January 31, 2014

Lessons From PTAB Decisions on Real Parties-in-Interest

An article by Christopher O'Brien and Michael Twomey, published in the January 28, 2014 edition of Law360.

October 23, 2013

USPTO Publishes Final Rules for Implementation of the Patent Law Treaty

On October 21, 2013, the United States Patent and Trademark Office published final rules for implementing the Patent Law Treaty.

January 24, 2013

Planning for March 16, 2013: Implementation of First-Inventor-to-File Standard

The final stages of the America Invents Act (AIA) go into effect on March 16, 2013. This alert highlights some of the upcoming changes and provides suggestions for patent owners to prepare for the date.

Professional Activities

Mr. O’Brien is admitted to practice before the Supreme Court of Virginia. He is also a member of the American Intellectual Property Law Association.


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JD, Brooklyn Law School, 2009

BS, Electrical Engineering, Texas A&M University, 2006

Bar Admissions

District of Columbia


United States Patent and Trademark Office

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