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 UOP LLC, Leydig Voit and Mayer, Ltd., and Greer Burns and Crain, Ltd..

Top cities in Illinois

All practitioners in Illinois

Justin Tyler Joseph

Reg. 77437

Patent agent

Glen Ellyn, IL · 60137

630-877-6388

J Kenneth Joung

Reg. 41881

Patent attorney

UOP LLC

Des Plaines, IL · 60017

847-391-2004

Mark Joy

Reg. 35562

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Karolina D. Jozwiak

Reg. 81930

Patent attorney

Medinah, IL · 60157

630-550-6567

Paul Gerard Juettner

Reg. 30270

Patent attorney

Greer Burns and Crain, Ltd.

Chicago, IL · 60606

312-360-0080

Thomas J Juettner

Reg. 69812

Patent agent

Greer Burns and Crain Ltd.

Chicago, IL · 60606

312-360-0080

Daniel William Juffernbruch

Reg. 33122

Patent attorney

Patents and Licensing LLC

Barrington, IL · 60010

847-458-6313

Thaddeus W. Juilfs

Reg. 82550

Patent attorney

O'Fallon, IL · 62269

618-239-3600

Charles E. Juister

Reg. 65573

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-423-3452

Jinwon Jung

Reg. 60912

Patent attorney

Argonne National Laboratory

Lemont, IL · 60439

630-252-6631

Sean J. Jungels

Reg. 66582

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

Ashley K. Justice

Reg. 82252

Patent attorney

McDermott Will & Emery

Chicago, IL · 60606

312-984-2759

Andrew J. Kabat

Reg. 71252

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

309-494-7842

Jeffrey J Kabbe

Reg. 56209

Patent agent

The Kabbe Law Group, LLC

Naperville, IL · 60540

888-909-1414

Tomasz J Kaczmarski

Reg. 63938

Patent attorney

Deer Park, IL · 60010

847-862-0274

Katherine E Kafkis

Reg. 84390

Patent agent

Foley & Lardner LLP

Chicago, IL · 60654

312-832-4395

Jack Kail

Reg. 27566

Patent attorney

Zenith Electronics LLC

Lincolnshire, IL · 60069

847-941-8011

John P Kale

Reg. 70805

Patent attorney

Reinhart Boerner Van Deuren, P.C.

Rockford, IL · 61107

815-654-5634

Khalid Kamal

Reg. 59629

Patent agent

Cardinal Law Group

Evanston, IL · 60201-5043

847-905-7111

Christin Noel Kaman

Reg. 51857

Patent agent

Brinks Hofer Gilson & Lione

Chicago, IL · 60611

312-245-5319

Ronald M Kaminecki

Reg. 42708

Patent attorney

Dialog LLC

Chicago, IL · 60647

773-276-3725

Chad A Kamler

Reg. 71381

Patent attorney

McDonnell Boehnen Hulbert & Berghoff

Chicago, IL · 60606

312-913-0001

Ronald Carl Kamp

Reg. 20466

Patent attorney

RCK Consulting

Glenview, IL · 60025

602-689-1672

Sarah G Kamper

Reg. 75177

Patent agent

INVO

Evanston, IL · 60201

847-491-5095

Matthew M. Kamps

Reg. 73622

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-936-5151

Kevin J Kane

Reg. 53089

Patent attorney

CCC Information Service Inc.

Chicago, IL · 60654

312-229-2147

Ji Soo Kang

Reg. 902017

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

312-358-6754

Kyle M. Kantarek

Reg. 74441

Patent attorney

K&L GATES LLP

Chicago, IL · 60602

312-807-4206

Henry S Kaplan

Reg. 25346

Patent attorney

Law Office Of Henry S Kaplan

Bensonville, IL · 60106

630-860-5773

Lawrence Mark Kaplan

Reg. 33521

Patent attorney

Northbrook, IL · 60062

847-205-3644

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.