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 Marshall, Gerstein & Borun LLP, Greer, Burns & Crain, Ltd., and Taft Stettinius & Hollister LLP.

Top cities in Illinois

All practitioners in Illinois

Austin J Kim

Reg. 70837

Patent agent

Naperville, IL · 60564

630-696-6942

B. Joe Kim

Reg. 41895

Patent attorney

Greer, Burns & Crain, Ltd.

Chicago, IL · 60606

312-360-0080

Catherine J Kim

Reg. 76634

Patent agent

Ottawa, IL · 61350

815-343-2222

Dhohyung Kim

Reg. 81706

Patent attorney

Taft Stettinius & Hollister LLP

Chicago, IL · 60601

312-836-5882

DongWook Kim

Reg. 82591

Patent agent

Chicago, IL · 60611

847-770-7729

Jae Hu Kim

Reg. 59648

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Jonathan S. Kim

Reg. 76883

Patent attorney

Long Grove, IL · 60047

847-826-0040

Jonathan H Kim

Reg. 65439

Patent attorney

Mayer Brown, LLP

Chicago, IL · 60606

312-701-8592

Katherine J Kim

Reg. 57343

Patent attorney

Spark IP Law

Chicago, IL · 60654

312-714-3065

Noah G. Kim

Reg. 81359

Patent attorney

Perkins Coie

Chicago, IL · 60606-1511

312-263-3454

Sebastian J Kim

Reg. 903111

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

818-437-6874

Lucas A. Kinard

Reg. 75651

Patent agent

Caterpillar Inc.

Peoria, IL · 61629-6450

972-228-6146

Alison M. King

Reg. 76897

Patent attorney

Winston & Strawn LLP

Chicago, IL · 60601

312-558-5992

John Joseph King

Reg. 35918

Patent attorney

The Law Office of John J. King

Wheaton, IL · 60189

630-310-2539

Julie C. King

Reg. 79375

Patent attorney

King Patent Law, PLLC

Champaign, IL · 61820

217-714-8558

Nicole G. Kinman

Reg. 82778

Patent attorney

Chicago, IL · 60610

317-696-8613

Layton F Kinney

Reg. 28628

Patent agent

Kinney and Associates

Chicago, IL · 60657

773-343-1125

Joseph M Kinsella· Jr

Reg. 45743

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

John P Kirby· Jr

Reg. 25348

Patent attorney

Lake Forest, IL · 60045

847-615-7177

Ivan Tomov Kirchev

Reg. 70671

Patent attorney

Argonne National Laboratory

Lemont, IL · 60439

630-252-9099

Jonathan Morgan Kirley

Reg. 59089

Patent attorney

Polsinelli PC

Chicago, IL · 60606-1599

312-873-3624

Heather R Kissling

Reg. 45790

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Paul Richard Kitch

Reg. 38206

Patent attorney

Greer, Burns & Crain, LTD

Chicago, IL · 60606

312-360-0080

David J Klann

Reg. 46833

Patent attorney

New World Medical

Lindenhurst, IL · 60046

224-280-4851

Louis A. Klapp· III

Reg. 73603

Patent attorney

Riley Safer Holmes & Cancila LLP

Chicago, IL · 60602

312-471-8680

Lara V Klapper

Reg. 54102

Patent attorney

Neal, Gerber, Eisenberg, LLP

Chicago, IL · 60602

312-269-5385

William J Klein

Reg. 43719

Patent attorney

Aumovio SE

Deer Park, IL · 60010

847-862-0270

John M Klempir

Reg. 57615

Patent attorney

Oak Brook, IL · 60523

312-485-1897

David E Klick

Reg. 64221

Patent attorney

University of Illinois at Chicago

Chicago, IL · 60612

312-996-7779

Catherine I Klima-Silberg

Reg. 40052

Patent attorney

Videojet Technologies Inc.

Wood Dale, IL · 60191

630-694-2779

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.