Illinois

Patent attorneys in Illinois

Illinois hosts 2,889 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 Actuate Law LLC, S.Z. Szczepanski Law Firm, and Leydig, Voit & Mayer.

Top cities in Illinois

All practitioners in Illinois

Michael D Switzer

Reg. 39552

Patent attorney

Actuate Law LLC

Chicago, IL · 60661

312-579-3136

Slawomir Z Szczepanski

Reg. 27957

Patent attorney

S.Z. Szczepanski Law Firm

Chicago, IL · 60614

312-636-0528

Ashlee B Szelag

Reg. 65580

Patent attorney

Leydig, Voit & Mayer

Chicago, IL · 60601

312-616-5600

David M Szum

Reg. 73882

Patent agent

Medline

Northfield, IL · 60093

224-258-9571

My Chau Ta

Reg. 80110

Patent agent

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Aaron C Taggart

Reg. 75597

Patent attorney

Cognizant

Chicago, IL · 60614

415-265-6336

Ashish R Talati

Reg. 53671

Patent attorney

Amin Talati LLC

Chicago, IL · 60603

312-466-1033

Teresa Dillon Tambolas

Reg. 47126

Patent attorney

Valent U.S.A. Corporation

Libertyville, IL · 60048

847-968-4729

Hao Tan

Reg. 73711

Patent attorney

Arch & Lake LLP

Chicago, IL · 60601

312-375-9408

Susan L. Tanaka

Reg. 71653

Patent attorney

Chicago, IL · 60654

208-490-0412

Wayne L Tang

Reg. 36028

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-425-8641

Matthew R Tanke

Reg. 73751

Patent attorney

Neal, Gerber & Eisenberg LLP

Chicago, IL · 60602-3801

312-269-5324

Aaron Kent Tantleff

Reg. 53879

Patent attorney

Foley & Lardner LLP

Chicago, IL · 60654

312-832-4367

Anna M Targowska

Reg. 71672

Patent attorney

Steptoe & Johnson LLP

Chicago, IL · 60606

312-577-1300

Bradley M. Taub

Reg. 67300

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-425-8563

Brandon M Taylor

Reg. 68679

Patent attorney

Des Plaines, IL · 60016-1707

217-299-7560

Jessica A Taylor

Reg. 83109

Patent attorney

Sycamore, IL · 60178

815-909-6674

Sarah L Taylor

Reg. 40836

Patent attorney

Robert Bosch LLC

Oakbrook Terrace, IL · 60181

331-264-5279

Douglas B Teaney

Reg. 33459

Patent attorney

Cardinal Law Group

Evanston, IL · 60201

847-905-7111

Caroline A Teichner

Reg. 71689

Patent attorney

The Kraft Heinz Company

Chicago, IL · 60601

312-282-5588

Elissa N Tenenbaum

Reg. 80976

Patent attorney

Crowell and Moring

Chicago, IL · 60611

312-840-3283

Daniel M. Terhune

Reg. 73129

Patent attorney

Fresenius Kabi USA, LLC

Lake Zurich, IL · 60047

224-716-0007

Nicholas K. Terrell

Reg. 71868

Patent attorney

Marshall Gerstein & Borun, LLP

Chicago, IL · 60606

312-474-6300

Maxwell H. Terry

Reg. 82672

Patent attorney

Sidley Austin LLP

Chicago, IL · 60603

312-853-2171

Reeya Thakrar

Reg. 76020

Patent attorney

Drinker Biddle & Reath LLP

Chicago, IL · 60606

214-405-6596

Jennifer J. Theis

Reg. 64321

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60604

312-854-8381

Michael F Thiel

Reg. 36033

Patent agent

Glenview, IL · 60025

847-724-3171

Jonathan Burgess Thielbar

Reg. 70453

Patent attorney

Loeb & Loeb, LLP

Chicago, IL · 60654

312-464-3326

David M Thimmig

Reg. 36034

Patent attorney

Cook Alex, Ltd.

Chicago, IL · 60606

312-236-8500

Bianca A Thomae

Reg. 61606

Patent attorney

Northbrook, IL · 60062

312-316-7706

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?

2,889 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.