Illinois

Patent attorneys in Illinois

Illinois hosts 2,889 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, Greenberg Traurig, LLP, and Seyfarth Shaw Attorneys.

Top cities in Illinois

All practitioners in Illinois

James J Lukas· Jr.

Reg. 59114

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601

312-456-8400

Susan L Lukasik

Reg. 35261

Patent attorney

Lombard, IL · 60148

630-620-1312

Paul J Lukitsch

Reg. 51976

Patent attorney

Seyfarth Shaw Attorneys

Chicago, IL · 60603

312-269-8945

Brian J Lum

Reg. 54282

Patent attorney

Ice Miller

Chicago, IL · 60606

312-726-8129

Jared R. Lund

Reg. 78413

Patent agent

Chicago, IL · 60605

815-985-9362

Van Metre Lund

Reg. 16968

Patent attorney

Evanston, IL · 60203

847-674-2407

Steve D Lundquist

Reg. 42816

Patent attorney

Caterpillar, Inc.

Peoria, IL · 61629-6490

309-675-4460

Kenneth J Luptak

Reg. 65043

Patent attorney

Chicago, IL · 60657

773-220-0663

Joshua J Lustig

Reg. 77904

Patent agent

McDonnell, Boehnen, Hulbert & Berghoff, LLP

Chicago, IL · 60606-6709

224-436-7998

John P Luther

Reg. 32261

Patent attorney

Ladas & Parry, LLP

Chicago, IL · 60604

312-427-1300 EX. 265

Alketa Lutolli

Reg. 84376

Patent agent

Honigman LLP

Chicago, IL · 60654

312-701-9300

Charles A. Lutzow· III

Reg. 71599

Patent agent

US Department of Energy

Lemont, IL · 60439

630-252-2446

Melanie N Lymon

Reg. 59954

Patent agent

Law Offices of Alan Barinholtz

Chicago, IL · 60606

312-704-4000

Brian Patrick Lynch

Reg. 58794

Patent agent

McAndrews Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

George T. Lyons· III

Reg. 76884

Patent attorney

McDonnell Boehnen Hulbert & Berghoff

Chicago, IL · 60606

312-913-3372

Katherine M Lyons

Reg. 78333

Patent attorney

Michael Best & Friedrich LLP

Chicago, IL · 60606

312-596-5854

Kathleen Ann Lyons

Reg. 31852

Patent attorney

Dennemeyer & Associates, LLC

Chicago, IL · 60606

312-978-1815

Maryann Maas

Reg. 38954

Patent attorney

LanzaTech, Inc

Skokie, IL · 60077

847-324-2400

Avani C Macaluso

Reg. 61496

Patent attorney

McDermott Will & Emery LLP

Chicago, IL · 60606

312-372-2000

Sean R MacDavitt

Reg. 64527

Patent attorney

Zebra Technologies Corporation

Lincolnshire, IL · 60069

631-738-5379

Brittany C MacDonald

Reg. 44159

Patent attorney

Greer Burns & Crain, Ltd.

Chicago, IL · 60606

312-360-0080

Edward Machado

Reg. 58372

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606-6709

312-913-2109

Richard A Machonkin

Reg. 41962

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Marc D Machtinger

Reg. 43434

Patent attorney

Law Office Of Marc D Machtinger, Ltd.

Buffalo Grove, IL · 60089

847-537-3537

John B MacIntyre

Reg. 41170

Patent attorney

Lucent Technologies, Inc.

Naperville, IL · 60566

630-979-4637

Thyannda M Mack

Reg. 73652

Patent attorney

Dykema Gossett, PLLC

Chicago, IL · 60606

312-627-2126

Corinne D. Macnichol

Reg. 84107

Patent agent

K&L Gates

Chicago, IL · 60602

312-807-4239

Mark A Magas

Reg. 72396

Patent attorney

DUNLAP BENNETT & LUDWIG, PLLC

Chicago, IL · 60601

312-868-0714

Eric S. Magleby

Reg. 80221

Patent attorney

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Amy L Mahan

Reg. 75997

Patent attorney

McDermott, Will & Emory

Chicago, IL · 60606

312-984-7742

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?

2,889 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.