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 Nixon Peabody LLP, Marshall, Gerstein & Borun LLP, and Greer, Burns & Crain, LTD.

Top cities in Illinois

All practitioners in Illinois

John C Gatz

Reg. 41774

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-425-8515

Justin R Gaudio

Reg. 60178

Patent attorney

Greer, Burns & Crain, LTD

Chicago, IL · 60606

312-360-0080

Apurv Gaurav

Reg. 73985

Patent attorney

K&L Gates LLP

Chicago, IL · 60602

312-807-4282

Brian T Gause

Reg. 67660

Patent agent

Chicago, IL · 60657

312-725-4303

Mario A. Gaviria

Reg. 82680

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5731

Mathew G Gavronski

Reg. 62617

Patent attorney

Clover Technologies Group LLC

Hoffman Estates, IL · 60169

312-801-7065

Michal A Gawlik

Reg. 74413

Patent attorney

Husch Blackwell LLP

Chicago, IL · 60606

312-985-8279

Xinyu Ge

Reg. 77000

Patent agent

Peoria, IL · 61615

309-578-5019

Jon Carl Gealow

Reg. 22386

Patent agent

Jon C. Gealow, Attorney At Law

McHenry, IL · 60051-9629

815-385-2329

Tiffany D Gehrke

Reg. 66234

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Stephen D Geimer

Reg. 28846

Patent attorney

Wood Phillips Katz Clark and Mortimer

Chicago, IL · 60661

312-876-2117

Theodore M. Gelderman

Reg. 79990

Patent attorney

Vedder Price, P.C.

Chicago, IL · 60601

312-609-7573

Daniel F. Gelwicks

Reg. 74803

Patent attorney

Steptoe LLP

Chicago, IL · 60606

312-577-1300

Russell J Genet

Reg. 42571

Patent attorney

Longford Capital Management, LP

Chicago, IL · 60601

312-971-4243

Kent E Genin

Reg. 37834

Patent attorney

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4200

Bobae K. Georgas

Reg. 69496

Patent agent

Decatur, IL · 62521

512-771-6795

Christopher N George

Reg. 51728

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Alexander D Georges

Reg. 70534

Patent agent

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606-6709

312-913-0001

Daniel Dragan Georgiev

Reg. 80647

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-977-4412

Gregory G Gerard

Reg. 37835

Patent attorney

Xerox Recovery Services

Schaumburg, IL · 60173

847-839-7736

Christopher J Gerardot

Reg. 73644

Patent attorney

Crowell & Moring

Chicago, IL · 60611

312-840-3268

David Alexander Gerasimow

Reg. 57512

Patent attorney

The Law Offices of David A. Gerasimow, P.C.

Chicago, IL · 60606

312-919-4254

Tasha Mary Francis Gerasimow

Reg. 65483

Patent attorney

Kirkland & Ellis

Chicago, IL · 60654

860-639-7099

Andrew G Gerla

Reg. 68760

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

231-754-9058

Robert M Gerstein

Reg. 34824

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Glen J Gesicki

Reg. 55863

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-937-3810

Zachary L Getzelman

Reg. 71292

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

David A Ghorbanpoor

Reg. 70639

Patent attorney

Chicago, IL · 60657

414-350-4864

Richard A Giangiorgi

Reg. 24284

Patent attorney

Clark Hill PLC

Chicago, IL · 60601

312-985-5549

Leonard M Giannone

Reg. 73836

Patent agent

McCracken & Gillen

Oak Brook, IL · 60523

630-286-7600

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.