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 Arch & Lake LLP, McAndrews Held & Malloy, Ltd., and Marshall, Gerstein & Borun LLP.

Top cities in Illinois

All practitioners in Illinois

Yichen Cao

Reg. 73489

Patent attorney

Arch & Lake LLP

Chicago, IL · 60601

630-386-5514

Christopher V Carani

Reg. 44049

Patent attorney

McAndrews Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Matthew R. Carey

Reg. 61082

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Donald M Carley

Reg. 47471

Patent attorney

State Farm Mutual Automobile Insurance Company

Bloomington, IL · 61704

309-766-8465

Benjamin E Carlsen

Reg. 52697

Patent agent

Carlsen Law Office

Chicago, IL · 60645

773-576-9328

Timothy R Carlson

Reg. 64212

Patent agent

Fresenius Kabi USA

Lake Zurich, IL · 60047

847-550-2571

John A Carnahan

Reg. 44592

Patent attorney

Husch Blackwell Sanders LLP

Chicago, IL · 60606

312-655-1500

Robert N Carpenter

Reg. 40409

Patent attorney

BP America Inc.

Naperville, IL · 60563

630-420-5678

George M Carrera· Jr

Reg. 50317

Patent agent

Des Plaines, IL · 60016

847-650-2261

Michael A Carrillo

Reg. 44595

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60690-2786

312-356-1313

William A. Carroll

Reg. 61795

Patent attorney

Chicago, IL · 60606

312-222-0800

Michael J Carrozza

Reg. 66980

Patent attorney

McAndrews, Held & Malloy Ltd.

Chicago, IL · 60661

312-775-8000

Carla E Carter

Reg. 52678

Patent agent

Law Office of Carla E. Buterman, LLC

Chicago, IL · 60604

312-957-8585

Hope W Carter

Reg. 46604

Patent attorney

Deere and Company World Headquarters

Moline, IL · 61265

309-765-4380

Janda' M Carter

Reg. 58033

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629-3410

309-675-4423

Joel Steven Carter

Reg. 29368

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-4045

Michael W. Carwin

Reg. 73066

Patent attorney

Armstrong Teasdale LLP

Chicago, IL · 60606

312-516-5625

Rachael C Casey

Reg. 70610

Patent attorney

n/a, IL · 60148

281-461-6100

Gregory P Casimer

Reg. 78719

Patent attorney

ThorellI & Associates

Chicago, IL · 60602

312-357-0300

Stephen J Cassin

Reg. 38098

Patent attorney

Westinghouse Electric Company

Lake Bluft, IL · 60044

847-990-7482

William J Cassin

Reg. 65192

Patent attorney

Benesch Friedlander Coplan & Aronoff LLP

Chicago, IL · 60606

312-517-9542

Dianne Casuto

Reg. 40943

Patent attorney

Dianne Casuto

Deerfield, IL · 60015-4200

847-938-3137

Marc A Cavan

Reg. 51537

Patent attorney

Baker & McKenzie, LLP

Chicago, IL · 60601

312-861-7972

Rebecca M Cavin

Reg. 68444

Patent attorney

K & L Gates LLP

Chicago, IL · 60602

312-807-4239

Richard Alan Cederoth

Reg. 31336

Patent attorney

Sidley Austin

Chicago, IL · 60603

312-853-7000

Daniel W Celander

Reg. 52710

Patent attorney

Celander Law Firm Ltd.

Evanston, IL · 60204

847-275-3868

Anita M Cepuritis

Reg. 70770

Patent attorney

Palatine, IL · 60067

847-654-2407

Talivaldis Cepuritis

Reg. 20818

Patent attorney

Olson & Cepuritis, Ltd.

Chicago, IL · 60606

312-580-1180

Keith Chadwick

Reg. 82970

Patent agent

Northbrook, IL · 60062

765-543-5096

Julius C. Chai

Reg. 84334

Patent agent

Chicago, IL · 60661

407-280-2371

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.