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 Brill IP Law Office, Locke Lord LLP, and Lempia Summerfield Katz, LLC.

Top cities in Illinois

All practitioners in Illinois

Robert J Brill

Reg. 36760

Patent agent

Brill IP Law Office

Chicago, IL · 60614

773-789-8342

Jacob C Britz

Reg. 77458

Patent attorney

Locke Lord LLP

Chicago, IL · 60606

312-443-0632

Daniel H. Broaddus

Reg. 68698

Patent attorney

Lempia Summerfield Katz, LLC

Chicago, IL · 60603

312-291-0860

Kristen D. Brooks

Reg. 80160

Patent attorney

Brooks Law and Consulting LLC

Naperville, IL · 60563

630-884-8084

Stefan A Brooks

Reg. 78795

Patent agent

Chicago, IL · 60606

312-474-6300

Tiffany M Brooks

Reg. 44564

Patent attorney

Chicago, IL · 60614

773-490-8604

Edward J Brosius

Reg. 28695

Patent attorney

Amsted Industries Inc.

Chicago, IL · 60601

312-819-8482

Carolyn M Brougham

Reg. 64008

Patent attorney

Wm. Wrigley Jr. Company

Chicago, IL · 60642

616-560-7989

Colleen A Brown

Reg. 51502

Patent attorney

Chicago, IL · 60657

773-975-7238

Jonathan Brown

Reg. 47451

Patent attorney

Olney, IL · 62450

703-338-5150

Marshall Joel Brown

Reg. 44566

Patent attorney

Foley & Lardner LLP

Chicago, IL · 60610

312-832-4358

Samuel A. Brown

Reg. 70191

Patent attorney

Husch Blackwell, LLP

Chicago, IL · 60606

773-426-6521

Robert E Browne· Sr

Reg. 26150

Patent attorney

Browne IP Law

Glenview, IL · 60026

847-337-8651

Eric L Broxterman

Reg. 54782

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Jerome S Brozek

Reg. 46344

Patent attorney

Jerome S. Brozek

Chicago, IL · 60645

773-743-3128

Daniel T. Bruce

Reg. 76292

Patent attorney

Chicago, IL · 60657

630-935-4301

Eric M. Brusca

Reg. 52664

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Kyle K Bryan

Reg. 61992

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-854-8378

Shawn M Buchanan

Reg. 65064

Patent attorney

Banner Witcoff

Chicago, IL · 60606

312-463-5484

Christopher J Buchko

Reg. 52668

Patent attorney

Corridor Law Group

Chicago, IL · 60606

312-981-0866

Byron Grant Buck· II

Reg. 40537

Patent attorney

Caterpillar, Inc.

Peoria, IL · 61656

309-675-6717

Laura E Buck

Reg. 59601

Patent agent

Peoria, IL · 61614

309-648-3476

Marianne Buckley

Reg. 68104

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Thomas W Buckman

Reg. 25756

Patent attorney

Glenview, IL · 60026

847-498-2760

Angelo J Bufalino

Reg. 29622

Patent attorney

Vedder Price, P.C.

Chicago, IL · 60601

312-609-7850

Mark J. Buisseret

Reg. 60979

Patent attorney

Evanston, IL · 60202

847-864-8505

Nicole M Bulman

Reg. 59421

Patent attorney

Miller Matthians & Hull

Chicago, IL · 60606

312-235-4766

Mark J Buonaiuto

Reg. 31593

Patent attorney

Yorkville, IL · 60560

847-650-9810

Bruce Burdick

Reg. 27422

Patent attorney

The Burdick Law Firm

Alton, IL · 62002

618-462-3450

Jeffrey B Burgan

Reg. 35463

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5654

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.