Illinois

Patent attorneys in Illinois

Illinois hosts 2,889 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 Pauley Petersen & Erickson, Northwestern University, and Taft Stettinius & Hollister, LLP.

Top cities in Illinois

All practitioners in Illinois

Francis Jan Koszyk

Reg. 56680

Patent agent

Prospect Heights, IL · 60070

847-894-9404

Nick C Kottis

Reg. 31974

Patent attorney

Pauley Petersen & Erickson

Hoffman Estates, IL · 60169

847-490-1400

Igor V Kourkine

Reg. 57948

Patent agent

Northwestern University

Evanston, IL · 60208

847-491-3559

Philip Y Kouyoumdjian

Reg. 56397

Patent attorney

Taft Stettinius & Hollister, LLP

Chicago, IL · 60601

312-836-4026

Cynthia Susan Kovacevic

Reg. 35578

Patent attorney

Wilmette, IL · 60091

847-251-2326

Karl D Kovach

Reg. 40278

Patent attorney

Cinch Connectivity Solutions,Inc.

Lombard, IL · 60148

630-705-6000

Julie A Kowal

Reg. 57178

Patent agent

CROWN Packaging Technology, Inc.

Tinley Park, IL · 60487-9286

708-239-5430

Francis C M Kowalik

Reg. 34646

Patent attorney

Walgreen Co. Intellectual Property

Deerfield, IL · 60015

847-315-4640

Timothy M Kowalski

Reg. 44192

Patent attorney

Google LLC

Chicago, IL · 60607

312-348-4723

John Walter Kozak

Reg. 25117

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5650

William J Kramer

Reg. 46229

Patent attorney

Loeb & Loeb LLP

Chicago, IL · 60654

312-464-3100

Delphine Marie Kranz

Reg. 29336

Patent agent

Univ Of Illinois

Urbana, IL · 61801

217-333-9389

Rebecca J Krasaeath

Reg. 65493

Patent attorney

Chicago, IL · 60614

773-871-9808

Michael L Krashin

Reg. 62072

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

Michael Krasniansky

Reg. 72820

Patent agent

McDonnell Boehnen Hulbert & Berghoff, LLP

Chicago, IL · 60606

312-913-3398

Marta Krason

Reg. 82108

Patent agent

Ropes & Gray LLP

Chicago, IL · 60606

312-845-1252

Rudy I Kratz

Reg. 43729

Patent attorney

Fitch, Even,Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Joseph P Krause

Reg. 32578

Patent attorney

Kelly & Krause, LTD

Downers Grove, IL · 60515

630-541-5750

Michael J Krautner

Reg. 59218

Patent attorney

Amsted Industries

Chicago, IL · 60601

312-819-8481

Jason S Kray

Reg. 66926

Patent attorney

McDonnell, Boehnen, Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

John A Kresl

Reg. 71794

Patent attorney

Park Ridge, IL · 60068

815-592-0306

Jeremy R Kriegel

Reg. 39257

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Eric T Krischke

Reg. 42769

Patent attorney

Benesch Friedlander Coplan and Aronoff

Chicago, IL · 60603-3433

312-212-4978

Nikhil R. Krishnan

Reg. 68879

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2323

Jonathan Jacob Krit

Reg. 37164

Patent attorney

Amin Talati & Upadhye, LLC

Chicago, IL · 60606

312-466-1033

James John Kritsas

Reg. 71714

Patent attorney

Morgan, Lewis & Bockius LLP

Chicago, IL · 60601

312-324-1109

Michael A Krol

Reg. 50821

Patent attorney

Welsh & Katz, Ltd.

Chicago, IL · 60606

312-655-1500

Tessa M. Kroll

Reg. 79327

Patent attorney

Caterpillar Inc.

Peoria, IL · 61529

309-494-2088

Jakub Mikolaj Krynski

Reg. 65650

Patent agent

Chatham, IL · 62629

847-809-8283

Linda A Kuczma

Reg. 30861

Patent attorney

Park Ridge, IL · 60068

312-505-3399

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?

2,889 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.