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 CNH Industrial America LLC, Polisinelli PC, and Baxter Healthcare Corporation.

Top cities in Illinois

All practitioners in Illinois

Robert J DeMento

Reg. 54726

Patent attorney

Evanston, IL · 60201

847-733-0171

Rickard K DeMille

Reg. 58471

Patent attorney

CNH Industrial America LLC

Oak Brook, IL · 60523

630-335-3533

Mark T. Deming

Reg. 69263

Patent attorney

Polisinelli PC

Chicago, IL · 60601

312-873-3625

Laura J Demoor

Reg. 39654

Patent attorney

Baxter Healthcare Corporation

Deerfield, IL · 60015

224-948-4620

Daniel Joseph Deneufbourg

Reg. 33675

Patent attorney

CTS Corporation

Lisle, IL · 60532

630-577-8891

Matthew P. Deng

Reg. 78863

Patent agent

Naperville, IL · 60565

331-203-0225

Anthony J. Denis

Reg. 77711

Patent attorney

Bannner & Witcoff, LTD

Chicago, IL · 60606

502-298-6542

Rhett R Dennerline

Reg. 40587

Patent attorney

Competitioner Law Group LLC

Northfield, IL · 60093

312-560-1464

Richard R Dennerline

Reg. 54611

Patent attorney

Richard R. Dennerline, Patent Attorney

Chicago, IL · 60603

312-873-3756

Taylor S Dennington

Reg. 66956

Patent attorney

Dentons US LLP

Chicago, IL · 60606

Mitchell L. Denti

Reg. 80095

Patent attorney

Jenner & Block LLP

Chicago, IL · 60654

312-840-7322

Robert J Depke

Reg. 37607

Patent attorney

Chicago Technology Law LLC

Orland Park, IL · 60462

312-275-5737

Mario Frank DeRango

Reg. 76360

Patent agent

Intechigence, LLC

Cary, IL · 60013

847-456-2461

Nicholas M Dernik

Reg. 67320

Patent agent

Chicago, IL · 60614

312-806-3320

Thomas L Derry

Reg. 46660

Patent agent

Edwards, IL · 61528

309-453-9936

Priya A. Desai

Reg. 75647

Patent attorney

Mayer Brown, LLP

Chicago, IL · 60606

312-701-7496

Kimberly S Devine

Reg. 75742

Patent attorney

Banner & Witcoff, LTD

Chicago, IL · 60606

312-463-5409

Donald R Devitt

Reg. 82201

Patent attorney

Chicago, IL · 60625

312-.95-3.1916

Joshua C. Devorkin

Reg. 82864

Patent agent

Fitch Even Tabin & Flannery LLP

Chicago, IL · 60603

312-577-7000

John C. Dewar

Reg. 84133

Patent agent

McAndrews, Held & Malloy

Chicago, IL · 60661

312-775-8000

Anthony J Dezonno

Reg. 51614

Patent agent

Bloomingdale, IL · 60108

630-539-7032

Muskan K. Dhatt

Reg. 902819

Limited recognition

DePaul University College of Law

Chicago, IL · 60604

Alexa L. Dian

Reg. 82851

Patent attorney

Elmhurst, IL · 60126

630-254-5113

Mary E Dicig

Reg. 40589

Patent attorney

Schwartz, Cooper, Greenburger & Krauss

Chicago, IL · 60601

312-516-4456

Richard Eugene Dick

Reg. 27778

Patent attorney

McAndrews, Held & Malloy LTD.

Chicago, IL · 60661

312-775-8000

Matthew S. Dicke

Reg. 58819

Patent attorney

K&L Gates LLP

Chicago, IL · 60602-4207

312-578-5415

Chad A Diehl

Reg. 64763

Patent attorney

Mayer Brown LLP

Chicago, IL · 60606

312-701-8022

Robert W Diehl

Reg. 35118

Patent attorney

BISHOP DIEHL & LEE. LTD.

Schaumburg, IL · 60173

847-925-9641

Azuka C. Dike

Reg. 68497

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-3000

Grant A Dingledine

Reg. 73469

Patent agent

Scientific Games

Chicago, IL · 60654

309-370-4894

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.