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 Abbott Laboratories, Roderick D. Thomas, P.C., and Sram LLC.

Top cities in Illinois

All practitioners in Illinois

Roderick D Thomas

Reg. 55672

Patent attorney

Roderick D. Thomas, P.C.

Hillside, IL · 60162

708-449-5000

Tina E Thomas

Reg. 75089

Patent attorney

Sram LLC

Chicago, IL · 60607

312-664-8800

Eley O Thompson

Reg. 36035

Patent attorney

Leydig Voit and Mayer, Ltd

Chicago, IL · 60601-6731

312-616-5600

Jacqueline L. Thompson

Reg. 81526

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603

312-577-700

Lawrence E Thompson

Reg. 41346

Patent attorney

The Thompson Law office P.C.

Lockport, IL · 60441

815-838-6033

Michael M. Thompson

Reg. 57572

Patent agent

Abbott Laboratories

Naperville, IL · 60564

610-513-8642

Sandra J. Thompson

Reg. 58845

Patent attorney

Naperville, IL · 60565

630-416-1995

Kirsten L. Thomson

Reg. 62861

Patent attorney

GrowIP Law Group LLC

Barrington, IL · 60010

734-645-7350

Marcus J Thymian

Reg. 43954

Patent attorney

GROWIP LAW GROUP LLC

Barrington, IL · 60010

312-371-7348

Ethan A. Tibbs

Reg. 78552

Patent agent

Chicago, IL · 60614

205-586-0719

Noah K. Tilton

Reg. 74672

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Scott A Timmerman

Reg. 55678

Patent attorney

Crowell & Moring

Chicago, IL · 60611

312-222-8125

William R. Tinker

Reg. 61369

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

515-802-6453

Mircea A Tipescu

Reg. 53690

Patent attorney

Benesch Friedlander Coplan & Aronoff LLP

Chicago, IL · 60606

312-212-4976

Algis A Tirva

Reg. 27237

Patent attorney

Tirva Law Offices

Northfield, IL · 60093

847-441-0400

Gael Diane Tisack

Reg. 51952

Patent attorney

Abbott Laboratories

Abbott Park, IL · 60064

122-436-04070

Robert P Toczycki

Reg. 38341

Patent attorney

Arlington Heights, IL · 60004

847-227-7909

Jeffrey G Toler

Reg. 38342

Patent attorney

MBHB

Chicago, IL · 60606

312-913-0001

Jimmie K. Tolliver

Reg. 62264

Patent attorney

Tolliver Law Office, LLC

Chicago, IL · 60601

312-253-7320

John G Tolomei

Reg. 30809

Patent attorney

Lake Zurich, IL · 60647-2220

847-772-6738

Thomas W Tolpin

Reg. 27600

Patent attorney

Tolpin & Partners, PC

Chicago, IL · 60602

312-698-8971

Michael E. Tomczak

Reg. 81698

Patent agent

Barnes & Thornburg LLP

Chicago, IL · 60606

312-889-5790

Michael S. Tomsa

Reg. 64264

Patent attorney

McAndrews, Held & Malloy

Chicago, IL · 60661

312-775-8081

Jonathan J.E. Torchman

Reg. 71722

Patent attorney

Torchman IP

Chicago, IL · 60654

847-208-6111

Philip Richard Torf

Reg. 52293

Patent attorney

Torf Law Firm

Northbrook, IL · 60062

847-564-4200

Rhea J Torman

Reg. 73753

Patent attorney

Swanson, Martin & Bell, LLP

Chicago, IL · 60611

312-222-8577

Caroline VK Hoffman Towler

Reg. 43674

Patent agent

Inverness, IL · 60010

847-277-0576

James Earl Tracy

Reg. 17793

Patent attorney

Orlando Park, IL · 60462

708-532-3124

Arthur N Trausch· III

Reg. 30430

Patent attorney

Lake Bluff, IL · 60044

847-295-5583

Thalassa K. Trickey

Reg. 82042

Patent agent

Decatur, IL · 62522

760-809-4202

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.