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 K&L Gates LLP, DePaul University College of Law, and Marshall, Gerstein & Borun LLP.

Top cities in Illinois

All practitioners in Illinois

Sean Joseph Barnes

Reg. 902817

Limited recognition

DePaul University College of Law

Chicago, IL · 60604

Derek W Barnett

Reg. 64635

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Joanna B Baron

Reg. 58159

Patent attorney

Willowbrook, IL · 60521

217-821-2609

James P Barr

Reg. 29511

Patent attorney

Wood River, IL · 62095

618-251-4440

Joseph B Barrett

Reg. 34769

Patent attorney

Baxter Health Care CORP

Deerfield, IL · 60015

847-948-3252

Michael E. Barrett

Reg. 74508

Patent attorney

CNA Global Specialty Lines

Chicago, IL · 60604

312-822-4194

Robert M Barrett

Reg. 30142

Patent agent

K&L Gates LLP

Chicago, IL · 60602-4207

312-807-4204

Timothy J Barron

Reg. 39599

Patent attorney

Jenner & Block LLP

Chicago, IL · 60654

312-923-8309

Alan L Barry

Reg. 30819

Patent attorney

K&L Gates LLP

Chicago, IL · 60602-4207

312-807-4438

Audrey L Bartnicki

Reg. 40499

Patent attorney

Abbott Laboratories

Abbott Park, IL · 60064-6008

847-938-3440

Noemi Bartolo

Reg. 902818

Limited recognition

DePaul University College of Law

Chicago, IL · 60604

Sara J Bartos

Reg. 51439

Patent attorney

Immigration Attorneys. LLP

Chicago, IL · 60601

312-661-9100

Paul J Bartusiak

Reg. 42300

Patent attorney

Motorola, Inc.

Schaumburg, IL · 60196

847-435-5692

Christen E. Barua

Reg. 61793

Patent agent

Chicago, IL · 60614

574-621-1184

Robert J. Barz

Reg. 74363

Patent agent

K&L Gates LLP

Chicago, IL · 60602

312-807-4233Q

Nicole A Bashor

Reg. 68573

Patent attorney

Quarles & Brady

Chicago, IL · 60654

312-715-5104

Levie M. Basok

Reg. 79531

Patent attorney

von Briesen & Roper, s.c.

Chicago, IL · 60606

312-676-7598

Thomas C Basso

Reg. 46541

Patent attorney

K&L Gates LLP

Chicago, IL · 60602-4207

312-807-4310

Philip L Bateman

Reg. 30127

Patent attorney

Attorney at Law

Decatur, IL · 62525

217-429-6400

Brent A Batzer

Reg. 66160

Patent agent

Upadhye Tang LLP

Hinsdale, IL · 60522

312-598-2612

Eric J Baude

Reg. 47413

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-938-8389

Jennifer A Bauer

Reg. 65911

Patent attorney

The Law Office of Jennifer Bauer

Saint Charles, IL · 60175

773-644-1165

Michael P Bauer

Reg. 53975

Patent attorney

Hospira, Inc.

Lake Forest, IL · 60045

224-212-2873

Timothy R Baumann

Reg. 40502

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Scott E Baxendale

Reg. 41605

Patent attorney

Miller, Matthias & Hull

Chicago, IL · 60606

312-977-9969

Alison A R Bayly

Reg. 80875

Patent agent

Michael Best & Friedrich LLP

Chicago, IL · 60606-0030

312-596-5896

Gregory C Bays

Reg. 40505

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Xiaobing Be

Reg. 64434

Patent attorney

Westchester, IL · 60154

314-540-8949

Danielle M Beach

Reg. 67652

Patent attorney

Clarendon Hills, IL · 60514

312-343-1884

Lawrence S Beall

Reg. 52601

Patent attorney

Rakoczy Molino Mazzochi Siwik LLP

Chicago, IL · 60654

312-222-5107

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.