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 Banner & Witcoff, Ltd., Hanley, Flight & Zimmerman, and Lempia Summerfield Katz LLC.

Top cities in Illinois

All practitioners in Illinois

John A. Webb· Jr.

Reg. 74592

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5421

Steven L Webb

Reg. 44395

Patent attorney

Hanley, Flight & Zimmerman

Chicago, IL · 60606

312-676-1763

Tyler W Webb

Reg. 66748

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60602

312-854-8374

Victoria R M Webb

Reg. 70742

Patent attorney

Banner & Witcoff, Ltd

Chicago, IL · 60606

312-463-5000

William A Webb

Reg. 28277

Patent attorney

W. A. Webb

Chicago, IL · 60614

773-248-5832

Brett J Weber

Reg. 73979

Patent attorney

K & L Gates LLP

Chicago, IL · 60602

312-807-4314

Don W Weber

Reg. 32321

Patent attorney

Troy, IL · 62294

618-973-5143

Benjamin E Weed

Reg. 65939

Patent attorney

K & L Gates LL

Chicago, IL · 60602

312-781-7166

Matthew D. Weeks

Reg. 78420

Patent agent

Metamora, IL · 61485

715-220-7264

Andrew W Weflen

Reg. 74262

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601-6745

312-616-5600

Jun Wei

Reg. 55717

Patent agent

McDermott Will & Emery LLP

Chicago, IL · 60606

312-984-2142

Michael J Weil

Reg. 74852

Patent attorney

Elk Grove Village, IL · 60007

847-828-0704

Taylor N Weilnau

Reg. 83005

Patent agent

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-2108

Wendy J Weimer

Reg. 52347

Patent attorney

Bell Boyd and Lloyd LLC

Chicago, IL · 60602

312-372-1121

Eric H Weimers

Reg. 33048

Patent attorney

Law Office of Eric H. Weimers

Chicago, IL · 60614

773-218-5532

Michael R Weiner

Reg. 38359

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

David L Weinstein

Reg. 28128

Patent attorney

Lake Forest, IL · 60045

847-615-2812

Mitchell J Weinstein

Reg. 37963

Patent attorney

Levenfeld Pearlstein

Chicago, IL · 60602

312-476-7593

Steven F Weinstock

Reg. 30117

Patent attorney

Wood Phillips

Chicago, IL · 60661-4592

312-876-2112

Aaron J Weinzierl

Reg. 57815

Patent attorney

United Airlines, Inc.

Chicago, IL · 60606

872-825-7578

Mark D Weis

Reg. 48826

Patent attorney

Mark D. Weis Law, P.C.

Elwood, IL · 60421

312-543-8163

Jeffery A Weisman

Reg. 64923

Patent attorney

Buffalo Grove, IL · 60089

847-727-8675

Adam S Weiss

Reg. 55719

Patent attorney

Polsinelli PC

Chicago, IL · 60601-3316

312-873-3644

Sandra B Weiss

Reg. 30814

Patent attorney

Northbrook, IL · 60062

847-764-8658

Harold N Wells· Jr

Reg. 26044

Patent attorney

Kelly Drye & Warren

Chicago, IL · 60606

312-857-2336

Patrick James Wells

Reg. 46355

Patent attorney

Law Office of Patrick J Wells

Chicago, IL · 60014

312-636-0395

Anthony Y T Wen

Reg. 66303

Patent attorney

Neal, Gerber & Eisenberg LLP

Chicago, IL · 60602

312-269-8000

Lucas L Wenthe

Reg. 68990

Patent attorney

Bonutti Technologies

Effingham, IL · 62401

217-342-3412

Matthew A. Werber

Reg. 62056

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602-4224

312-977-4458

Lynette K Werner

Reg. 60316

Patent attorney

Lempia Braidwood LLC

Chicago, IL · 60606

312-291-0860

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.