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 Panduit Corp., Foley & Lardner LLP, and McAndrews Held & Malloy Ltd.

Top cities in Illinois

All practitioners in Illinois

Christopher S Clancy

Reg. 44618

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

708-532-1800

Abigail J. Clark

Reg. 84404

Patent agent

Foley & Lardner LLP

Chicago, IL · 60654

312-832-4701

Dorien J Clark

Reg. 80527

Patent attorney

McAndrews Held & Malloy Ltd

Chicago, IL · 60661

859-644-9235

Jeffrey Lynn Clark

Reg. 29141

Patent attorney

Wood, Phillips

Chicago, IL · 60661

312-876-1800

Scott P. Clark

Reg. 83283

Patent attorney

Chicago, IL · 60661

408-318-9705

Ralph Emerson Clarke· Jr

Reg. 28200

Patent agent

Arlington Heights, IL · 60004

847-749-2245

Derek E Clements

Reg. 74183

Patent attorney

Clements IP, LLC

Naperville, IL · 60563

773-706-8060

Michael D Clifford

Reg. 60550

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Brian S Clise

Reg. 47497

Patent attorney

Chicago, IL · 60610

312-848-9651

David W Clough

Reg. 36107

Patent attorney

Much Shelist PCc

Chicago, IL · 60606

312-521-2762

Matthew G. Clouthier

Reg. 84630

Patent agent

Foley and Lardner LLP

Chicago, IL · 60654

312-832-4937

Christine M Cochran

Reg. 52757

Patent attorney

Northwestern University

Evanston, IL · 60208

847-491-3630

James A Coffing

Reg. 36485

Patent attorney

Motorola Solution, Inc.

Schaumburg, IL · 60196

847-576-0885

Charles S Cohen

Reg. 32210

Patent attorney

Caterpillar Inc.

Deerfield, IL · 60015

224-551-4015

Eric D Cohen

Reg. 38110

Patent attorney

Klintworth & Rozenblat IP LLP

Chicago, IL · 60607

773-570-3330

Michael I Cohen

Reg. 57105

Patent attorney

Baxter Healthcare Corporation

Deerfield, IL · 60015

224-948-2868

Willis S Colburn

Reg. 46634

Patent agent

University of Illinois

Urbana, IL · 61801

217-265-6217

Zane A. Coleman

Reg. 65754

Patent agent

Phostech LLC

Elmhurst, IL · 60126

773-789-9263

Patricia Rea Coleman James

Reg. 37155

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-937-4558

Daniel William Collins

Reg. 31912

Patent attorney

Wood, Phillips, Katz, Clark & Mortimer

Chicago, IL · 60661

312-876-2126

James A Collins

Reg. 43557

Patent attorney

Chicago, IL · 60603

312-291-0860

Theresa Conduah

Reg. 60227

Patent attorney

United Air Lines Inc.

Chicago, IL · 60601

312-997-7578

John Boyd Conklin

Reg. 30369

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601-6731

312-616-5685

James Joseph Conlon

Reg. 25965

Patent attorney

Conlon and Associatess

Chicago, IL · 60660

321-726-0545

Charles William Baldridge Connors

Reg. 24890

Patent attorney

Magneco/Metrel INC

Addison, IL · 60101

630-543-6660

John E Conour

Reg. 59054

Patent attorney

McDonnell Boehnen Hulbert and Berghoff LLP

Chicago, IL · 60606-6709

312-913-3317

Richard E Conser

Reg. 34091

Patent attorney

Golf, IL · 60029

847-724-8656

James Bombard Conte

Reg. 54661

Patent attorney

Welsh & Katz, LTD.

Chicago, IL · 60606-3912

312-655-1500

Robert F I Conte

Reg. 20354

Patent attorney

Glencoe, IL · 60022

847-835-3309

Joseph M Conti

Reg. 67770

Patent attorney

Chicago, IL · 60647

847-721-8590

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.