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Ari Feinstein

Ari Feinstein is a litigation associate in the firm’s Washington, D.C., office.  Ari’s practice focuses on patent litigation, trademark litigation, and trademark oppositions. Ari also has experience with data privacy and data security compliance and procedure and is CIPP/US-certified.

Ari has experience working on intellectual property adversarial matters in a wide variety of industries, including consumer electronics, pharmaceuticals, medical devices, food and beverage, fitness and nutrition, semiconductors, HVAC, and hydrometallurgy. 

During law school, Ari was an executive editor and later the Managing Editor of the Journal of Law and Technology. He also participated in the school’s Patent & Licensing Clinic. Ari received his Bachelor’s Degree in Chemistry from Case Western Reserve University.

Ari worked as a summer associate at the firm in 2016 and joined the firm in 2017.


University of Virginia School of Law, J.D., Virginia Journal of Law and Technology, Managing Editor
Case Western Reserve University, B.A., Chemistry
District of Columbia Bar
IAPP CIPP/US Data Privacy Certification
State Bar of Virginia
U.S. Court of Appeals for Veterans Claims
U.S. Patent and Trademark Office

Antibodies & Immunology



Chemical, Industrial & Materials

Analytical Chemistry


Cosmetics & Personal Care Products

HVAC & Passive Ventilation

Organic Chemistry

Pharmaceutical Chemistry



Consumer Products & Services

Aesthetics & Personal Care Products

Food & Beverage

Electrical, Semiconductor & Computer Technology

Electronics & Semiconductors

Software & IT


Geothermal Energy

Medical Devices & Procedures

Obesity Management & Bariatrics

Sleep Apnea


Antibodies & Immunology


Biosimilars & Hatch-Waxman Litigation



HatchWaxman Litigation
Inter Partes Review (IPR)
ITC Litigation
Patent Litigation
Patent Trial & Appeal Board (PTAB) Litigation
Trade Secret
Trade Secret & Employee Mobility Litigation
Trade Secret & Employee Mobility Litigation
Trademark & Brand Protection
Trademark Enforcement
Trademark Trial & Appeal Board (TTAB) Litigation 
TTAB Proceedings

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