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 Fitch, Even, Tabin & Flannery, LLP, Jones Day, and Deere & Company.

Top cities in Illinois

All practitioners in Illinois

Joshua C Heitsman

Reg. 66687

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-5075

John Jacob Held· Jr

Reg. 21061

Patent attorney

McAndrews Held & Malloy

Chicago, IL · 60661

312-775-8000

Stephen B Heller

Reg. 30181

Patent attorney

Cook Alex LTD

Chicago, IL · 60606

312-236-8500

Kathleen M Helm-Bychowski

Reg. 53011

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601-6731

312-616-5600

Michael Eugene Helminski

Reg. 41829

Patent attorney

Sargent & Lundy, LLC

Chicago, IL · 60603

312-269-6628

Brandon C. Helms

Reg. 61742

Patent attorney

Addy Hart P.C.

Chicago, IL · 60611

312-731-6568

Bryan G. Helwig

Reg. 78192

Patent attorney

MBHB

Chicago, IL · 60606

312-913-0001

Carlton J. Hemphill

Reg. 81169

Patent agent

Benesch, Friedlander, Coplan & Aronoff LLP

Chicago, IL · 60606

312-212-4949

Michael K Hendershot

Reg. 53012

Patent attorney

Jones Day

Chicago, IL · 60601

312-269-4399

Cory James Henderson

Reg. 903014

Limited recognition

University of Illinois Chicago School of Law

Chicago, IL · 60604

773-717-9650

Samuel J. Henderson

Reg. 73348

Patent agent

Springfield, IL · 62712

312-970-0844

James Robert Henes

Reg. 26908

Patent attorney

The Henes Firm

Burr Ridge, IL · 60527

630-456-6201

Paul B. Henkelmann

Reg. 65891

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Roger Anthony Heppermann

Reg. 37641

Patent attorney

Marshall ,Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

James O. Heracklis

Reg. 77852

Patent agent

AbbVie

North Chicago, IL · 60044

847-935-0205

Christopher Scott Hermanson

Reg. 48244

Patent attorney

Greer, Burns and Crain, Ltd

Chicago, IL · 60606

312-360-0080

Daniel R Hernandez

Reg. 68767

Patent agent

Hillside, IL · 60162

708-544-1117

Felipe Hernandez· Jr.

Reg. 61971

Patent attorney

P3ip

Downers Grove, IL · 60515

312-449-9566

Gilberto Hernandez

Reg. 46483

Patent attorney

John Crane Group Corporation

Morton Grove, IL · 60053

847-967-2461

Joseph A Herndon

Reg. 50469

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Brian P Herrmann

Reg. 63145

Patent attorney

Fitch, Even, Tabin & Flannery LLP

Chicago, IL · 60603

312-629-7926

Margaret A Herrmann

Reg. 76096

Patent attorney

The Kraft Heinz Company

Glenview, IL · 60025

847-646-2000

Joseph H Herron

Reg. 53019

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

John L. Hertenstein

Reg. 74784

Patent attorney

AF Holding Company

Sullivan, IL · 61951

217-728-8388 EXT. 111

Jordan Herzog

Reg. 38182

Patent attorney

Patzik, Frank & Samotny, LTD

Chicago, IL · 60606

312-551-8300

Brett Alan Hesterberg

Reg. 31837

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

Joseph F Hetz

Reg. 41070

Patent attorney

Crowell & Moring

Chicago, IL · 60654

312-321-4200

Mark Warren Hetzler

Reg. 38183

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603

312-577-7000

John J Heurich· Jr.

Reg. 74414

Patent attorney

Sual Ewing Arnstein & Lehr LLP

Chicago, IL · 60601

312-876-7872

Timothy J Heverin

Reg. 77386

Patent attorney

Jones Day

Chicago, IL · 60601-1692

312-782-3939

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.