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 McDonnell Boehnen Hulbert & Berghoff LLP, Brinks Hofer Gilson & Lione, and Dennemeyer & Associates LLC.

Top cities in Illinois

All practitioners in Illinois

Igor V Dubinsky

Reg. 58243

Patent attorney

Brinks Hofer Gilson & Lione

Chicago, IL · 60611-5599

312-321-4200

Shawn E. Duckworth

Reg. 62277

Patent attorney

Dennemeyer & Associates LLC

Chicago, IL · 60606

312-380-6492

Sarah J Duda

Reg. 62860

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606-6709

312-913-0001

Monika A Dudek

Reg. 47538

Patent attorney

Trading Technologies

Chicago, IL · 60606

312-476-1118

Nicholas M Dudziak

Reg. 65480

Patent attorney

Chicago, IL · 60605

312-493-4404

Christine A Dudzik

Reg. 31245

Patent attorney

Kelley, Drye & Warren LLP

Chicago, IL · 60606

312-857-2579

Douglas J. Duff

Reg. 68535

Patent attorney

Deere & Company

Moline, IL · 61265

309-748-7679

Gregory A Duff

Reg. 57507

Patent attorney

RMMS LLP

Chicago, IL · 60654

312-222-6315

Meggan Fitzgerald Duffy

Reg. 46674

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Kathleen Farrell Duhig

Reg. 62616

Patent attorney

Office of the Illinos Attorney General

Chicago, IL · 60601

312-814-3000

Dominik P. Dukala

Reg. 74732

Patent agent

Chicago, IL · 60602

312-603-3629

Margaret M Duncan

Reg. 30879

Patent attorney

Loyola University Chicago School of Law

Chicago, IL · 60611

773-805-0354

Sydney G Duncan

Reg. 82710

Patent agent

K&L Gates LLP

Chicago, IL · 60602

205-344-3315

Mackenna E. Dunn

Reg. 83667

Patent attorney

Chicago, IL · 60610

708-334-1762

Jeffrey P Dunning

Reg. 50686

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601

312-456-6612

Dustin T. Dutchuk

Reg. 80147

Patent agent

Chicago, IL · 60657

701-391-5477

Scott M Dyar

Reg. 73407

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-3332

Judie D Dziezak

Reg. 40599

Patent attorney

Hoffman Estates, IL · 60192

847-624-2436

David H. Dziura

Reg. 61045

Patent agent

Chicago, IL · 60630

847-840-1241

James B Eagle

Reg. 35496

Patent attorney

Eagle and Eagle

Rock Island, IL · 61201

309-788-7671

Patrick S Eagleman

Reg. 44665

Patent attorney

Baxalta US Inc.

Bannockburn, IL · 60015

224-940-2630

Jacob T Earl

Reg. 79813

Patent attorney

Banner Witcoff

Chicago, IL · 60606

312-463-5000

Kevin C Earle

Reg. 56146

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629-6450

309-675-2759

Jonathan Brennan Easter

Reg. 78658

Patent attorney

Foley + Lardner LLP

Chicago, IL · 60091

312-832-4527

Lindsay K Eastman

Reg. 68399

Patent attorney

Glanbia Performance Nutrition

Downers Grove, IL · 60515

224-471-3537

Kelly J Eberspecher

Reg. 48525

Patent attorney

Steptoe & Johnson LLP

Chicago, IL · 60606

312-577-1300

Idongesit E Ebong

Reg. 74272

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-977-4440

Vangelis Economou

Reg. 32341

Patent attorney

Economou IP Law

Chicago, IL · 60690

847-644-3500

Cory Robert Edwards

Reg. 78368

Patent attorney

Blank Rome, LLP

Chicago, IL · 60606

312-776-2589

E. Bradley Edwards

Reg. 60074

Patent agent

University of Illinois

Urbana, IL · 61801

217-244-6453

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.