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, Honigman LLP, and Neal, Gerber & Eisenberg LLP.

Top cities in Illinois

All practitioners in Illinois

Lawrence H Aaronson

Reg. 35818

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Dennis J Abdelnour

Reg. 77172

Patent attorney

Honigman LLP

Chicago, IL · 60606

312-701-9348

Holby Matthew Abern

Reg. 47372

Patent attorney

Neal, Gerber & Eisenberg LLP

Chicago, IL · 60602

312-269-8428

Cassandra L. Abernathy

Reg. 75330

Patent attorney

Chicago, IL · 60610

813-335-4542

John Abramic

Reg. 51031

Patent attorney

Steptoe & Johnson LLP

Chicago, IL · 60606

312-577-1300

David Brian Abramowitz

Reg. 56500

Patent attorney

Locke Lord LLP

Chicago, IL · 60606-4410

312-443-0591

Hugh A Abrams

Reg. 31937

Patent attorney

Shook, Hardy & Bacon LLP

Chicago, IL · 60606

312-704-5332

Matthias Abrell

Reg. 47377

Patent attorney

Marshall Gerstein & Borun, LLP

Chicago, IL · 60606

312-474-6300

Julie B Ackerman

Reg. 50867

Patent attorney

Banner and Witcoff LTD

Chicago, IL · 60606

312-715-1000

Rachel M. Ackerman

Reg. 78456

Patent attorney

Greer, Burns & Crain, Ltd

Chicago, IL · 60606

312-344-1313

Kelly M Acosta

Reg. 55778

Patent attorney

Crown Steel Sales, Inc.

Chicago, IL · 60623

773-376-1700

Kenneth R Adamo

Reg. 27299

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2671

Amma B Addai

Reg. 76021

Patent attorney

AbbVie, Inc.

North Chicago, IL · 60064

847-937-0396

Vasudev N Addanki

Reg. 57583

Patent attorney

Leahy, Eisenberg & Fraenkel, Ltd.

Chicago, IL · 60601

312-368-4554

Meredith Martin Addy

Reg. 37883

Patent attorney

AddyHart P.C.

Chicago, IL · 60611

312-320-4200

Sana Afreen

Reg. 84332

Patent agent

Chicago, IL · 60659

773-751-9417

Christopher D Agnew

Reg. 43464

Patent attorney

Partner

Chicago, IL · 60661

312-834-4334

Ali I Ahmed

Reg. 56848

Patent attorney

FRESENIUS KABI USA

LAKE ZURICH, IL · 60047

847-550-5593

Syed M. Ahmed

Reg. 72836

Patent agent

Aurora, IL · 60503

630-210-6791

Cindy S Ahn

Reg. 46356

Patent attorney

Kirkland & Ellis

Chicago, IL · 60601

312-861-2219

David M Airan

Reg. 38811

Patent attorney

Leydig Voit and Mayer Ltd.

Chicago, IL · 60601

312-616-5600

Adam D Airhart

Reg. 51387

Patent attorney

Hollister Incorporated

Libertyville, IL · 60048

224-475-6030

Sneha K. Akarapu

Reg. 84040

Patent attorney

Chicago, IL · 60601

312-609-7549

Daniel P Albers

Reg. 44008

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60606

312-214-8311

John M Albright

Reg. 40482

Patent attorney

Hub International Limited

Chicago, IL · 60654

312-279-4740

Richard J Albright· Jr.

Reg. 74459

Patent attorney

Ladas & Parry, LLP

Chicago, IL · 60604

312-427-1300

Dana Andrew Alden

Reg. 46475

Patent attorney

MacLean - Fogg Company

Mudelein, IL · 60060

847-970-4645

John L Alex

Reg. 22017

Patent attorney

Cook Alex LTD

Chicago, IL · 60606

312-236-8500

Louis J. Alex

Reg. 59631

Patent attorney

Cook, Alex, McFarron, Manzo

Chicago, IL · 60606

312-334-8555

Syed Nazeer Ali

Reg. 72271

Patent attorney

Hanley, Flight & Zimmerman

Chicago, IL · 60606

312-580-1020

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.