Illinois

Patent attorneys in Illinois

Illinois hosts 2,917 active patent practitioners registered with the USPTO Office of Enrollment and Discipline. Patent attorneys and patent agents can both prepare and file patent applications, but only patent attorneys can also offer legal advice on prosecution strategy, freedom-to-operate analyses, and infringement opinions in Illinois. Practitioners are concentrated across 20 cities, with the largest clusters in the metros listed below. Notable firms with multiple registered practitioners in the state include Arch & Lake LLP, Neal, Gerber & Eisenberg LLP, and Cardinal Health.

Top cities in Illinois

All practitioners in Illinois

William J Lenz

Reg. 44208

Patent attorney

Neal, Gerber & Eisenberg LLP

Chicago, IL · 60602

312-269-8000

Jacob R Lenzke

Reg. 63699

Patent attorney

Cardinal Health

Chicago, IL · 60606

312-270-2035

Nicholas M Leonard

Reg. 70485

Patent attorney

AbbVie, Inc.

North Chicago, IL · 60064

847-938-6268

Kate M Lesciotto

Reg. 63417

Patent attorney

Leydig, Voit & Mayer. Ltd.

Chicago, IL · 60601

312-616-5600

David Lesht

Reg. 30472

Patent attorney

Sperling Kenny Nachwalter, L.L.C.

Chicago, IL · 60654

312-445-4949

Justin J Lesko

Reg. 69643

Patent attorney

Law Offices of Steven G. Lisa, LTD

Chicago, IL · 60603

773-484-3285

Paul A Lesko

Reg. 45364

Patent attorney

Simmons, Browder, Gianaris, Angelides and Barnerd LLC

Alton, IL · 62002

314-833-4826

Muriel F Leung

Reg. 84293

Patent attorney

Akerman LLP

Chicago, IL · 60606

312-634-5741

Howard E Levin

Reg. 50480

Patent attorney

Bridges & Mavrakakis LLP

Chicago, IL · 60601

312-216-1626

Marc R Levin

Reg. 58454

Patent attorney

Skokie, IL · 60077

847-677-0780

Mitchell J Levin

Reg. 51940

Patent attorney

Cook County States Attorneys Office

Chicago, IL · 60602

312-603-8626

Yuri Z Levin-Schwartz

Reg. 82477

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Russell Evan Levine

Reg. 32153

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2466

Robin Sue Levine Stoller

Reg. 34505

Patent attorney

Common questions

Do I need a patent attorney based in Illinois?

No. Every USPTO-registered patent practitioner is licensed to file applications on behalf of inventors in any state, regardless of where the practitioner's office is. Choosing a Illinois-based practitioner can simplify in-person inventor signings, local meetings, and same-time-zone calls, but it is not a legal requirement.

How many patent attorneys are licensed in Illinois?

2,917 active USPTO-registered patent practitioners list a Illinois office address on the OEDCI roster. This includes both patent attorneys (who can also offer legal advice) and patent agents (who can prepare and file patents but not offer broader legal advice).

What is the difference between a patent attorney and a patent agent?

Both pass the USPTO Patent Bar and can prepare, file, and prosecute patent applications. Only patent attorneys also hold a state bar license, meaning they can additionally offer legal advice on infringement, licensing, and litigation strategy. Patent agents tend to charge less per hour and are common at large in-house IP departments.