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 Brinks Gilson & Lione, McDonnell Boehnen Hulbert & Berghoff LLP, and Deere & Company.

Top cities in Illinois

All practitioners in Illinois

Christian C Damon

Reg. 72273

Patent attorney

The Allstate Corporation

Northbrook, IL · 60062

616-822-0433

Andreas Michael Danckers

Reg. 32652

Patent attorney

Ulrichson LLC

Libertyville, IL · 60048-9721

224-280-2123

George N Dandalides

Reg. 69713

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Jacob E Dander

Reg. 80540

Patent agent

University of Chicago

Chicago, IL · 60615

773-834-3210

Brenda L Danek

Reg. 57596

Patent attorney

Latham & Watkins LLP

Chicago, IL · 60611

312-876-7700

Shelley C Danek

Reg. 57712

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Mien Thuy Dang

Reg. 54055

Patent attorney

Baker & McKenzie

Chicago, IL · 60601

312-861-6649

Jeremy C Daniel

Reg. 70472

Patent attorney

Oak Park, IL · 60302

773-410-3239

Rodney Allen Daniel

Reg. 31605

Patent attorney

Brinks Gilson & Lione

Chicago, IL · 60611

312-321-4238

Ryan M Daniel

Reg. 70796

Patent attorney

Fresenius Kabi USA, LLC

Lake Zurich, IL · 60047

847-550-2326

Danielle T Darling

Reg. 37536

Patent attorney

Wilmette, IL · 60091

847-256-7866

Manav Das

Reg. 70528

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-2117

Priya S. Dave

Reg. 83328

Patent agent

Batavia, IL · 60510

630-842-2815

Jonathan B. David

Reg. 62113

Patent attorney

Skokie, IL · 60076

847-337-2085

Kyle A. Davis

Reg. 66507

Patent attorney

Dykema Gossett PLLC

Chicago, IL · 60606

312-627-2182

Ronald H. Davis

Reg. 67990

Patent attorney

Naperville, IL · 60567-3964

630-961-9885

Marilyn S Dawkins

Reg. 31140

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-4325

Scott M Day

Reg. 52801

Patent attorney

Fenwal, Inc.

Lake Zurich, IL · 60047

847-550-2389

Brianna C De Frank

Reg. 82200

Patent agent

Prospect Heights, IL · 60070

847-400-6487

Joseph S De Frank

Reg. 65246

Patent attorney

The Chamberlain Group

Oakbrook, IL · 60523

630-247-1264

Matthew L. De Preter

Reg. 61799

Patent attorney

Aonberg Goldgehn Davis & Garmisa

Chicago, IL · 60611

312-755-9600

Justin D. DeAngelis

Reg. 69958

Patent attorney

Quarles & Brady LLP

Chicago, IL · 60654

312-715-5168

David L DeBruin

Reg. 35489

Patent attorney

Honigman Miller Schwartz and Cohn LLP

Chicago, IL · 60606-1734

312-701-9300

Linda S DeBruin

Reg. 37704

Patent attorney

Textura Corporation

Deerfield, IL · 60015

847-943-3593

Eric A. DeChant

Reg. 79492

Patent agent

DeChant, Inc.

Chicago, IL · 60656

773-317-0156

Randall Earl Deck

Reg. 34078

Patent agent

United States Dept Of Agriculture

Peoria, IL · 61604

309-681-6515

Jordan A. DeGayner

Reg. 77848

Patent agent

Cooley LLP

Chicago, IL · 60606

312-881-6392

James V DeGiulio

Reg. 66719

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-2109

Timothy Quinn Delaney

Reg. 33674

Patent attorney

Brinks Gilson & Lione

Chicago, IL · 60611

312-321-4200

Stephen David Dellett

Reg. 32564

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-4232

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.