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 Cherskov Flaynik & Gurda, LLC, Buchanan Ingersoll & Rooney PC, and Brinks Hofer Gilson & Lione.

Top cities in Illinois

All practitioners in Illinois

Yi Lu

Reg. 84142

Patent attorney

Cherskov Flaynik & Gurda, LLC

Oak Brook, IL · 60523

312-621-1330

Ronald V. Lucarelli

Reg. 82720

Patent agent

Buchanan Ingersoll & Rooney PC

Chicago, IL · 60606

312-261-8764

John Kenneth Lucas

Reg. 27024

Patent attorney

Brinks Hofer Gilson & Lione

Chicago, IL · 60610

312-321-4220

Kenneth S. Luchesi

Reg. 58673

Patent attorney

Jones Day

Chicago, IL · 60601-1692

312-782-3939

Jonathan J Luciano

Reg. 73498

Patent attorney

Chicago, IL · 60614

305-215-1382

Timothy P Lucier

Reg. 44882

Patent attorney

Abbott Laboratories

Abbott Park, IL · 60064-6008

847-937-7177

Peter Stephen Lucyshyn

Reg. 19875

Patent attorney

Wilmette, IL · 60091

847-256-0686

Steven C. Ludington

Reg. 39005

Patent attorney

Highland Park, IL · 60035

847-212-5178

Cori L Ludwig

Reg. 56973

Patent agent

Trading Technologies International, Inc.

Chicago, IL · 60606

312-476-1069

Lisa M Luedke

Reg. 51151

Patent attorney

Baker and McKenzie

Chicago, IL · 60601

312-861-8616

Sara A Lufrano

Reg. 53245

Patent attorney

Lord, Bissell & Brook, LLP

Chicago, IL · 60606-4410

808-542-7851

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

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.