1400 Wewatta Street Suite 600, Denver, CO USA 80202
701 Pennsylvania Avenue, NW Suite 200, Washington, DC USA 20004
Justin Krieger is Managing Partner of Kilpatrick’s Denver office and is a leading patent strategist with more than 25 years of experience guiding clients through complicated intellectual property challenges. Known for his ability to distill scientifically intricate issues into clear, actionable strategies, Justin is highly sought after for conducting freedom-to-operate (FTO) analyses in the chemistry, biochemistry, oil and gas, mechanical systems, and medical device fields. He is equally adept at evaluating patents for validity and conducting non-infringement assessments, helping clients navigate dense landscapes of competitor patents. His strategic insights and sound counsel have repeatedly earned the trust of clients facing high-stakes, bet-the-company decisions in competitive, innovation-driven markets.
In addition to client counseling, Justin is also an active PTAB litigator, having represented both petitioners and patent owners in dozens of PTAB proceedings. His outstanding record has set him apart as one of the most effective PTAB advocates in the country. Justin also handles district court and ITC litigation and patent prosecution matters across a range of technical fields. He chairs the American Chemical Society (ACS) Committee on Intellectual Property and is Chair-Elect of the Colorado Section of ACS.
Justin teaches a course on PTAB litigation as an adjunct professor at the University of Denver Sturm College of Law. He also lectures and publishes frequently on various intellectual property topics, including PTAB litigation, trade secrets, the America Invents Act, and the “on sale” bar to patentability.
Justin’s work has earned him repeated recognition: Law Week Colorado named him Barrister’s Best IP Litigator in 2021 and 2024, Managing IP labeled him an “IP Star” and nominated him for PTAB Practitioner of the Year in 2025, and he is ranked by Chambers USA, LawDragon 500, and IAM 1000 – The World's Leading Patent Practitioners. Justin was also recognized in 2024, 2025 and 2026 by The Best Lawyers in America® for Patent Law and was recommended by Legal 500 US in 2018, 2020, 2021, 2024 and 2025 for Patent Prosecution.
While attending law school, Justin was a member of the Florida Law Review.
Experience
Justin supervises a post-grant patent practice team that has consistently obtained favorable results for the firm’s clients. He has served as lead counsel in well over 20 IPR and PGR proceedings, representing clients both as petitioner and patent owner. Justin has repeatedly beaten the odds: representing Patent Owners, he successfully achieved denial of institution in 8 IPRs, and won 5 IPRs after trial. All five cases going to trial resulted in the validation of all instituted claims—a result achieved in fewer than 5% of IPR proceedings. Representing client TerraLithium LLC, in 2020-2021, Justin achieved complete victories in 7 IPRs, with institution denied or all patent claims affirmed after trial for all 7 different patents.
Representing Petitioners, Justin has been equally successful: In 2017, Justin successfully represented Petitioner in two IPRs, resulting in the Patent Owner requesting adverse judgment. In 2018, Justin successfully took three IPRs to trial on behalf of Petitioner. In 2019, he achieved another win as IPR petitioner, resulting in an early grant of a client’s motion to terminate the proceeding on terms highly favorable for the client.
Justin 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. Justin also has been actively involved in numerous patent litigation matters and has participated in all phases of discovery, claim construction (Markman hearings), trial, and appeals. He is also experienced in Section 337 investigations before the U.S. International Trade Commission (ITC).
Justin leads a patent prosecution team for clients in the fields of industrial chemistry and chemical engineering, pharmaceuticals, agrochemicals, medical devices and analytical instruments.
Insights View All
News Releases
Blogs
Pre-Institution Overhaul: Unpacking the PTAB’s New Briefing Procedures
No Magic Words Required: Clarifying What Constitutes “Analogous Art” in PTAB Proceedings
PTAB Update: The USPTO Issues Revised Interim Guidelines for Director Review
5 Key Takeaways | PTAB Update: The Waning Impact of Fintiv on Discretionary Denials
Kilpatrick Townsend Attorneys Share Winning Formula for PTAB Success
Adversarial Patent Prosecution℠
Asset Creation - Prosecution & Counseling
Licensing, Transactions & Monetization
Chemicals: Industrial Chemistry & Materials and Material Science
Life Sciences: Biotechnology, Pharmaceuticals & Bioinformatics
University of Florida College of Law J.D. (1999)
College of William and Mary B.S. (1995) Chemistry
Colorado (2018)
District of Columbia (2002)
New York (2000)
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
U.S. Patent and Trademark Office
U.S. Supreme Court
University of Denver Sturm College of Law, Adjunct Professor of Law, PTAB Practice
Board Member, Colorado IP American Inn of Court
Law360, Colorado Editorial Advisory Board (2024-2025)
Chair, American Chemical Society (ACS) Committee on Patents and Related Matters
Chair-Elect, American Chemical Society (ACS), Colorado Section
Board of Trustees, ACS Division of Chemical Education (2020-2022)
PTAB Bar Association
Federal Circuit Bar Association (Member, PTAB & TTAB Committee)
American Bar Association
American Intellectual Property Law Association
Intellectual Property Owners Association
ITC Trial Lawyers Association
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