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 McDonnell Boehnen Hulbert & Berghoff LLP, Lempia Summerfield Katz LLC, and Kirkland & Ellis LLP.

Top cities in Illinois

All practitioners in Illinois

Andrew P. Lea

Reg. 80460

Patent agent

Chicago, IL · 60615

715-644-8332

Garret A Leach

Reg. 41932

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Craig D Leavell

Reg. 48505

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60606

312-214-4868

Chaerim Lee

Reg. 800120

Limited recognition

Quarles & Brady, LLP

Chicago, IL · 60606

414-277-3058

Christopher J Lee

Reg. 41934

Patent attorney

Lee Sheikh Megley & Haan

Chicago, IL · 60604

312-982-0070

Dennis C Lee

Reg. 60922

Patent attorney

Discover Financial Services

Riverwoods, IL · 60015

224-405-1744

Garrett J. Lee

Reg. 82563

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

George I Lee

Reg. 39269

Patent attorney

Lee Sullivan Shea & Smith, LLP

Chicago, IL · 60606

312-754-9606

Gilsoo Lee

Reg. 84028

Patent agent

Lisle, IL · 60532

540-750-6215

Jared K. Lee

Reg. 72786

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601

801-478-6900

Kwanwoo Lee

Reg. 70137

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-423-3459

Matthew Won Bin Lee

Reg. 60222

Patent agent

Champain, IL · 61820

Nicholas S Lee

Reg. 54260

Patent attorney

Dickinson Wright PLLC

Chicago, IL · 60603

312-572-6914

Peter S Lee

Reg. 64728

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

779-254-5200

Richard T. Lee

Reg. 60091

Patent attorney

Livevol, Inc.

Chicago, IL · 60604

312-878-8140X 138

Sang K Lee

Reg. 67541

Patent attorney

Law Offices of Sang Lee

Vernon Hills, IL · 60061

847-208-8617

Sooho Lee

Reg. 69642

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Tristan J. Lee

Reg. 81722

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

William Marshall Lee· Jr

Reg. 26935

Patent attorney

Barnes and Thornburg

Chicago, IL · 60606

312-357-1313

William Marshall Lee

Reg. 16853

Patent attorney

Barrington, IL · 60010

847-304-6541

Martin T LeFevour

Reg. 37378

Patent attorney

LeFevour Law, LLC

Burr Ridge, IL · 60527

708-246-4246

Julie L Leichtman

Reg. 55184

Patent agent

Loyola University Chicago School of Law

Chicago, IL · 60611

Brittany A. Leigh

Reg. 82084

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

615-341-8333

Gregory J. Leighton

Reg. 57672

Patent attorney

Neal Gerber & Eisenberg

Chicago, IL · 60602

312-269-8000

Robert D. Leighton

Reg. 62425

Patent agent

Goldberg Kohn, Ltd.

Chicago, IL · 60603

312-201-4000

Felisa L. Leisinger

Reg. 65383

Patent attorney

Department of Energy, OCC-IPL

Argonne, IL · 60439

630-252-2304

Bryan J Leitenberger

Reg. 61012

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-854-8367

Bryan J Lempia

Reg. 39746

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-854-8360

Michael J Lenisa

Reg. 72724

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1588

Jessica J. Lenoir

Reg. 83579

Patent agent

Saul Ewing LLP

Chicago, IL · 60601

724-602-6485

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.