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 Schiff Hardin LLP, McDonnell Boehnen Hulbert & Berghoff LLP, and Archer Daniels Midland Company.

Top cities in Illinois

All practitioners in Illinois

Jason G Harp

Reg. 42634

Patent agent

Schiff Hardin LLP

Chicago, IL · 60606

312-258-5500

David S Harper

Reg. 42636

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Jesse S. Harper

Reg. 65850

Patent attorney

Archer Daniels Midland Company

Decatur, IL · 62526

217-853-5570

Kristen Joy Steenberg Harrell

Reg. 51783

Patent agent

Arlington Heights, IL · 60004

216-372-9813

Margaret C Harrington

Reg. 83718

Patent agent

Cooley LLP

Chicago, IL · 60606

312-881-6426

Charles E Harris· II

Reg. 56269

Patent attorney

Mayer Brown LLP

Chicago, IL · 60606-4637

312-701-8934

Michael J Harris

Reg. 62957

Patent attorney

Arnold & Porter Kaye Scholer LLP

Chicago, IL · 60602-4231

312-583-2422

Richard D Harris

Reg. 27898

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601-1732

312-456-8400

Robert Patrick Hart

Reg. 35184

Patent attorney

AddyHart P.C.

Chicago, IL · 60611

949-337-0568

Michael F Harte

Reg. 64518

Patent attorney

Office of University Counsel, University of Illinois

Chicago, IL · 60612-7228

312-996-7762

H Michael Hartmann

Reg. 28423

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

Julianne M Hartzell

Reg. 44748

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Salim Arif Hasan

Reg. 38175

Patent attorney

Leydig Voit & Mayer, Ltd

Chicago, IL · 60601-6731

312-616-5600

Irfan I. Hassam-Malani

Reg. 80198

Patent agent

Saul Ewing LLP

Chicago, IL · 60601

312-876-7100

Ashley N. Hatzenbihler

Reg. 82183

Patent attorney

Honigman LLP

Chicago, IL · 60606

312-701-9320

Ryan B Hauer

Reg. 73646

Patent attorney

Winston & Strawn, LLP

Chicago, IL · 60601

312-558-8116

Garrett M. Hausman

Reg. 73184

Patent attorney

Michael Best & Friedrich LLP

Chicago, IL · 60606

312-222-0800

Jeanny Haw

Reg. 51790

Patent attorney

Mayer, Brown, Rowe & Maw, LLP

Chicago, IL · 60603-3441

312-782-0600

Peter G Hawkins

Reg. 68687

Patent attorney

Actuate Law LLC

Chicago, IL · 60661

312-579-3009

Shaun Burrus Hawkinson

Reg. 67332

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-854-8376

Eric D Hayes

Reg. 53004

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

John William Hayes

Reg. 33900

Patent attorney

Miller, Matthias & Hull LLP

Chicago, IL · 60606

312-235-4762

Matthew T Hays

Reg. 74847

Patent attorney

Dykema Gossett PLLC

Chicago, IL · 60606

312-627-2134

Jessica Y He

Reg. 62909

Patent agent

Naperville, IL · 60540

630-890-1891

Judy K He

Reg. 75173

Patent attorney

Crowell and Moring LLP

Chicago, IL · 60611

312-840-3157

Yingbo He

Reg. 82278

Patent agent

Chicago, IL · 60608

630-456-2990

David D Headrick

Reg. 40642

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Anastasia Heffner

Reg. 47638

Patent attorney

Brinks Hofer Gilson & Lione

Chicago, IL · 60611

312-321-4896

Marion D Hefner

Reg. 41826

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Andrew J Heinisch

Reg. 43666

Patent attorney

Reinhart, Boerner, Van Deuren, P.C.

Rockford, IL · 61107

815-633-5300

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.