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 Leydig, Voit & Mayer, Ltd., Crowell & Moring LLP, and Edward Chalfie IP Law, P.C..

Top cities in Illinois

All practitioners in Illinois

Edward J Chalfie

Reg. 29370

Patent attorney

Edward Chalfie IP Law, P.C.

Northbrook, IL · 60062

312-593-6626

Jagriti R Chander

Reg. 46610

Patent agent

Chicago, IL · 60640

773-275-1825

Paul A Chandler

Reg. 40553

Patent attorney

Mayer Brown Rowe & Mau, LLP

Chicago, IL · 60603

312-701-8499

Hyeon Seok Chang

Reg. 81802

Patent agent

Naperville, IL · 60565

510-529-8363

Mark Chao

Reg. 37293

Patent attorney

Sauk Village, IL · 60411-7300

847-920-4929

Lawrence John Chapa

Reg. 39135

Patent attorney

Libertyville, IL · 60048

847-816-9106

Erin E Chapman

Reg. 54024

Patent attorney

First Trust Portfolios L. P.

Lisle, IL · 60532

630-322-7696

James A. Chard

Reg. 84252

Patent attorney

Foley & Lardner LLP

Chicago, IL · 60654

817-821-7248

Audrey W Charles

Reg. 56320

Patent agent

Ball Horticultural Company

West Chicago, IL · 60185

630-588-3118

Brent A Chatham

Reg. 73954

Patent attorney

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601-6731

312-616-5600

Daniel T. Chavka

Reg. 61192

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Jeffrey Alan Chelstrom

Reg. 57915

Patent attorney

Honigman LLP

Chicago, IL · 60606-1734

312-701-9300

An-Tzyr Amy Chen

Reg. 55885

Patent agent

Chicago, IL · 60640

773-293-1498

Angie A. Chen

Reg. 68492

Patent attorney

Chicago, IL · 60613

773-837-3281

David C. Chen

Reg. 66308

Patent attorney

Northside Law Office, Ltd.

Evanston, IL · 60202

424-243-6529

Gang Chen

Reg. 68754

Patent agent

Crowell & Moring LLP

Chicago, IL · 60611

312-840-3263

Jingwen Chen

Reg. 902871

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

773-818-98301

Jun Chen

Reg. 77811

Patent attorney

Venture Partner, LLC

Chicago, IL · 60611

812-325-2116

Kyle Yikai Chen

Reg. 76704

Patent attorney

JPMorgan Chase Bank, N.A.

Chicago, IL · 60603

312-336-2379

Lawrence M. Chen

Reg. 67768

Patent attorney

Siemens

Buffalo Grove, IL · 60089

847-243-3121

McKenzie J Chen

Reg. 79222

Patent agent

Perkins Coie, LLP

Chicago, IL · 60610-1511

312-324-8695

Pei Chen

Reg. 73692

Patent attorney

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Portia Chen

Reg. 44075

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-937-8272

Sylvia Y Chen

Reg. 39633

Patent attorney

Google Inc.

Chicago, IL · 60607

630-708-7257

Jun Cheng

Reg. 75406

Patent attorney

Crowell & Moring LLP

Chicago, IL · 60654

312-840-3298

Daniel Ronald Cherry

Reg. 29054

Patent attorney

Hahn Loeser & Parks, LLP

Chicago, IL · 60606

312-637-3030

Michael J Cherskov

Reg. 33664

Patent attorney

Cherskov Flaynik & Guroa

Chicago, IL · 60602

312-621-1330

Hsu Heng A Chi

Reg. 73468

Patent attorney

Allstate Insurance

Northbrook, IL · 60062

312-420-9089

Theodore J. Chiacchio

Reg. 58649

Patent attorney

Chicago, IL · 60610

917-714-8085

Patricia M Chidiac

Reg. 55061

Patent agent

SIGNODE INDUSTRIAL GROUP LLC

Glenview, IL · 60026

847-657-4057

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.