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 Nixon Peabody LLP, Benesch, friedlander, Coplan & Aronoff LLP, and Law Offices Of Davis Chin.

Top cities in Illinois

All practitioners in Illinois

Davis Michael Chin· Jr.

Reg. 61668

Patent attorney

Benesch, friedlander, Coplan & Aronoff LLP

Chicago, IL · 60606

312-212-4949

Davis Chin

Reg. 26854

Patent attorney

Law Offices Of Davis Chin

Frankfort, IL · 60423-7675

815-510-7186

Michelle A. Chin

Reg. 80360

Patent attorney

Latham & Watkins LLP

Chicago, IL · 60611

312-777-7246

Michael A Chinlund

Reg. 55064

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Pramod Chintalapoodi

Reg. 68659

Patent attorney

CHIP LAW GROUP

CHICAGO, IL · 60611

312-803-4821

Michelle J. Chitambar

Reg. 76358

Patent agent

Southern Illinois University

Carbondale, IL · 62901

618-453-4544

Sucheta N Chitgopekar

Reg. 58469

Patent attorney

Law Office of Sucheta Bhagat

Hoffman Estates, IL · 60192

847-705-5315

Elliott Sungwoong Cho

Reg. 74928

Patent attorney

William Park & Associates

Hinsdale, IL · 60521

630-908-7652

Lawrence M Cho

Reg. 39942

Patent attorney

Champaign, IL · 61821

217-377-2500

Timothy M Cho

Reg. 61567

Patent attorney

Chicago, IL · 60608

310-259-3795

Andrew Y. Choi

Reg. 79793

Patent attorney

U.S. Department of Energy

Lemont, IL · 60439

301-363-0610

Hang Rak Choi

Reg. 65357

Patent attorney

Drinker Biddle & Reath LLP

Chicago, IL · 60606

312-569-1463

Mitul R Chowdhury

Reg. 79537

Patent agent

Cardinal Intellectual Property

Evanston, IL · 60201

847-905-71222

Tanzina Chowdhury

Reg. 46624

Patent attorney

Glendale Heights, IL · 60139

630-639-7913

Jon P Christensen

Reg. 34137

Patent attorney

Welsh Husch Blackwellm LLC

Chicago, IL · 60606

312-526-1500

Leah S Christoforidis

Reg. 64474

Patent attorney

Red Chalk Group

CHICAGO, IL · 60606

847-390-0703

Angelo J. Christopher

Reg. 81594

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-977-4391

Daniel Nick Christus

Reg. 29626

Patent attorney

McDermott Will & Emery LLP

Chicago, IL · 60606-5096

312-984-7689

Chia-Hsin Chu

Reg. 63022

Patent attorney

Chicago, IL · 60611

608-698-1616

Michael P Chu

Reg. 37112

Patent attorney

McDermot Will & Emery

Chicago, IL · 60606

312-984-5485

Peter W Chuang

Reg. 67381

Patent agent

Chicago, IL · 60661

562-726-2206

Gregory R. Churney

Reg. 78923

Patent agent

Quarles & Brady LLP

Chicago, IL · 60606

312-715-2724

Katherine I. Chwistek

Reg. 83076

Patent agent

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Jack R Cielak

Reg. 61916

Patent agent

Deer Park, IL · 60010

847-708-1283

David L Ciesielski

Reg. 57432

Patent attorney

McDonnell Boehnen Hulbert

Chicago, IL · 60606

312-913-0001

Jeffrey M. Cikalo

Reg. 71341

Patent attorney

Continental Automotive Systems, Inc.

Deer Park, IL · 60010

847-862-4029

Magdalena O Cilella

Reg. 56619

Patent agent

Brinks Gilson & Lione

Chicago, IL · 60611

312-321-4200

Sorinel Cimpoes

Reg. 48311

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-425-8542

Nicholas H. Ciulla

Reg. 78409

Patent attorney

Mayer Brown LLP

Chicago, IL · 60606

317-354-3108

Scott Daniel Clair

Reg. 56329

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-5075

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.