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 Deere & Company, Huron Consulting Group, and Information & Patent Services, LLC.

Top cities in Illinois

All practitioners in Illinois

Xavier P Diokno

Reg. 62794

Patent attorney

Huron Consulting Group

Chicago, IL · 60607

312-880-3064

Joseph DiSalvo

Reg. 39959

Patent agent

Information & Patent Services, LLC

Downers Grove, IL · 60515

630-852-6792

Louis DiSanto

Reg. 51331

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606-7407

312-463-5000

Rebecca S Dise

Reg. 65111

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Michael J Dobbs

Reg. 58093

Patent attorney

U.S. Department of Energy

Argonne, IL · 60439

630-252-2164

Jasper William Dockrey

Reg. 33868

Patent attorney

Chicago, IL · 60657

847-863-5625

Alvin B Dodek

Reg. 34577

Patent attorney

WH Trading, LLC

Chicago, IL · 60026

312-372-4557

Kristen A Dola

Reg. 70625

Patent attorney

RinLaures LLC

Chicago, IL · 60654

773-387-3200

Margaret M. Dolan

Reg. 61087

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Kyle B Dombeck

Reg. 80899

Patent agent

Chicago, IL · 60625

630-441-8494

Robert D Donoghue

Reg. 42493

Patent attorney

Holland & Knight LLP

Chicago, IL · 60603

312-578-6553

Justin R Donoho

Reg. 67322

Patent attorney

Grippo & Elden

Chicago, IL · 60606

312-704-7713

Bradford A Donovan

Reg. 58483

Patent attorney

Deere & Company

Moline, IL · 61265

309-748-4255

Breda Donovan

Reg. 52828

Patent agent

Chicago, IL · 60618

646-660-5333

Thomas Joseph Donovan

Reg. 33231

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60690

312-214-8329

Justin E. Doop

Reg. 76773

Patent attorney

Quarles and Brady LLP

Chicago, IL · 60654-3406

312-715-5274

Richard L Dornfeld

Reg. 29789

Patent agent

Aurora, IL · 60506-4937

630-418-0740

Vasilios D Dossas

Reg. 30745

Patent attorney

Niro, Haller and Niro

Chicago, IL · 60602

312-236-0733

Kathryn J Doty

Reg. 40593

Patent attorney

Polsinelli Shughart PC

Edwardsville, IL · 62025

618-692-2600

Maria E. Doukas

Reg. 67084

Patent attorney

Morgan, Lewis & Bockius LLP

Chicago, IL · 60601

312-324-1454

Anthony E Dowell

Reg. 39661

Patent attorney

Dowell IP

Chicago, IL · 60610

312-291-8351

Greg W Downs

Reg. 54668

Patent attorney

Techni-Core, Inc.

Skokie, IL · 60077

847-673-8300

Andrew J Doyle

Reg. 70006

Patent attorney

Reinhart Boerner & Van Deuren P.C.

Rockford, IL · 61107

773-425-0260

James J Drake

Reg. 34584

Patent attorney

Drake & Associates

Geneva, IL · 60134

989-859-7220

Jeffrey M Drake

Reg. 54075

Patent attorney

Litwin Kach

Chicago, IL · 60611

312-380-1706

Daniel E Dreger

Reg. 52831

Patent attorney

Alight Solutions

Lincolnshire, IL · 60069

847-442-3435

W Dennis Drehkoff

Reg. 27193

Patent attorney

Dennis IP Law Group, LLC

Wilmette, IL · 60091

847-906-4406

David M Dremann

Reg. 71708

Patent attorney

Deere & Company

Moline, IL · 61265

309-748-9927

Grantland Gilbert Drutchas

Reg. 32565

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-2121

Brandon J. Dube

Reg. 64442

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

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.