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 K&L Gates LLP, McDonnell Boehnen Hulbert & Berghoff LLP, and McAndrews Held and Malloy LTD.

Top cities in Illinois

All practitioners in Illinois

Sandra A Frantzen

Reg. 48799

Patent attorney

McAndrews Held and Malloy LTD

Chicago, IL · 60661

312-775-8000

Margaret Clare Frederick

Reg. 66608

Patent attorney

K&L Gates LLP

Chicago, IL · 60602

312-807-4276

Jason R Freeck

Reg. 76908

Patent attorney

K&L Gates, LLP

Chicago, IL · 60602

312-807-4345

John C Freeman

Reg. 34483

Patent agent

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4200

Jonathan D. Freilich

Reg. 68326

Patent attorney

Venable LLP

Chicago, IL · 60606

312-859-9339

Diego Fernando Freire

Reg. 77715

Patent attorney

Dykema

chicago, IL · 60606

773-640-0652

Joseph R Freund

Reg. 55191

Patent attorney

Cook, Alex, McFarron, Manzo, Cummings

Chicago, IL · 60606

312-236-8500

David A Frey

Reg. 43618

Patent attorney

Klintworth & Rozenblat LLP

Chicago, IL · 60607

773-572-2020

Eugene F Friedman

Reg. 25627

Patent attorney

Friedman & Friedman, Ltd.

Chicago, IL · 60605

312-922-8882

Leonard Friedman

Reg. 37135

Patent attorney

Hahn Loeser & Parks, LLP

Chicago, IL · 60606

312-637-3005

Victoria Friedman

Reg. 58853

Patent attorney

McDermott, Will & Emery LLP

Chicago, IL · 60606

312-372-2000

David M Frischkorn

Reg. 32833

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Catherine M Fritz

Reg. 70635

Patent agent

Husch Blackwell LLP

Chicago, IL · 60606

312-985-8276

Adam J. Fromm

Reg. 59563

Patent attorney

Clark Hill PLC

Chicago, IL · 60601

312-985-5908

Eric B Fuller

Reg. 59298

Patent agent

Chicago, IL · 60610

703-507-0940

Jori R. Fuller

Reg. 57628

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Nathan Joseph Fuller

Reg. 77410

Patent agent

Chicago, IL · 60602

317-371-0942

Timothy J Fullin

Reg. 50685

Patent attorney

Circle Group Holdings, Inc.

Mundelein, IL · 60060

847-549-6002

Lisa L. Furby

Reg. 73111

Patent attorney

Jones Day

Chicago, IL · 60606

312-269-1525

Michael P Furmanek

Reg. 58495

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Frank Justin Fury

Reg. 77340

Patent attorney

Woodridge, IL · 60517-9998

619-414-7914

Kalim S Fuzail

Reg. 45805

Patent attorney

BP America Inc.

Naperville, IL · 60563

630-420-3748

James A Gabala

Reg. 29537

Patent attorney

Law Office of ......

Inverness, IL · 60010

847-804-1010

Ralph J Gabric

Reg. 34167

Patent attorney

Brinks Gilson & Lione

Chicago, IL · 60611-5599

312-321-4200

Abdelkader Gacem

Reg. 52474

Patent agent

Brinks Hofer Gilson & Lione

Chicago, IL · 60611-5599

312-321-4299

Bruce M Gagala

Reg. 28844

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

Ron Galant

Reg. 60558

Patent attorney

Polsinelli PC

Chicago, IL · 60606

312-873-3633

Omar D Galaria

Reg. 59207

Patent agent

Baker & McKenzie, LLP

Chicago, IL · 60601

312-861-6635

Christopher J. Galfano

Reg. 73263

Patent attorney

Banner & Witcoff, LTD

Chicago, IL · 60606

312-463-5447

John Paul A. Galgano

Reg. 81645

Patent attorney

K&L Gates LLP

Chicago, IL · 60602

952-255-9885

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.