Justin Krieger is a registered patent attorney who focuses on client counseling, patent office and district court litigation, and patent prosecution. Mr. Krieger’s technical focus includes chemistry, chemical engineering, medical devices, metallurgy, nanotechnology, mechanical engineering, consumer products, business methods, and software technology. He has experience prosecuting domestic and international patent applications including reexamination and reissue applications.

Mr. Krieger has an active Inter Partes Review (IPR) practice, having served as lead counsel in numerous IPR proceedings. He has successfully defended several IPR proceedings, resulting in early decisions of non-institution without the need or expense of trial. In 2016, Mr. Krieger successfully defended a client in 3 IPR proceedings through trial, resulting in the validation of all instituted claims—a result achieved in less than 5% of IPR proceedings.

He also actively prepares non-infringement and validity opinions including comprehensive freedom-to-operate (FTO) analyses in the chemical, polymer, medical device, and mechanical arts from both due diligence and litigation perspectives. Mr. Krieger is also involved in various trademark matters, including trademark prosecution, oppositions and negotiating co-existence agreements.

Mr. Krieger also has been actively involved in numerous patent litigation matters and has participated in all phases of discovery, trial, and appeals. He is also experienced in Section 337 investigations before the U.S. International Trade Commission (ITC).

Mr. Krieger lectures and publishes frequently on various intellectual property topics, including patent office litigation such as IPR and Post Grant Review (PGR) proceedings, as well as on how best to protect trade secrets, and the Defend Trade Secrets Act of 2016.

Prior to joining the firm, Mr. Krieger worked as a shareholder in the northern Virginia office of an IP boutique firm where his areas of practice included patents, trademarks and client counseling. Previously, Mr. Krieger was a partner in the Washington, D.C. office of an international law firm where he participated in numerous patent lawsuits before district courts and the U.S. International Trade Commission.

While attending law school, Mr. Krieger was a member of the Florida Law Review.

Professional & Community Activities

American Bar Association, Member

Federal Circuit Bar Association, Member

American Intellectual Property Law Association, Member

Intellectual Property Owners Association, Member

American Chemical Society, Member

ITC Trial Lawyers Association, Member

PTAB and TTAB Committee (Federal Circuit Bar Association), Member

PTAB Bar Association, Member

Committee on Patents and Related Matters (ACS), Member


  • University of Florida College of Law, J.D. (1999)
  • College of William and Mary, B.S., Chemistry (1995)

Bar Admissions

  • District of Columbia (2002)
  • New York (2000)
  • Virginia (2013)


  • U.S. Patent and Trademark Office (2001)
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. District Court for the District of Columbia
  • U.S. District Court for the Eastern District of Virginia

Who We Are

What fully engaged means to me:

Getting knee-deep in the technology, asking questions, and thinking ahead to eliminate problems before they occur.

Suite 900, 607 14th Street, NW
Washington, DC, 20005-2018
t +1 202.481.9922
f +1 202.380.0913

Justin L. Krieger

Experience Highlights

Daicel v. Celanese
Counsel for patentee Celanese in five inter partes review petitions filed by competitor Daicel challenging validity of Celanese patents related to more
Patent prosecution and counseling for vascular products manufacturer
The firm provides patent prosecution and counseling services for vascular products manufacturer related to catheters. more