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 Benesch, Friedlander, Coplan & Aronoff LLP, AbbVie Inc., and McDonald Hopkins LLC.

Top cities in Illinois

All practitioners in Illinois

Alisha A. Contractor

Reg. 82152

Patent agent

Benesch, Friedlander, Coplan & Aronoff LLP

Chicago, IL · 60606

312-273-1637

Adam B. Conway

Reg. 65840

Patent attorney

AbbVie Inc.

Chicago, IL · 60064

847-937-6618

Erin R Conway

Reg. 67081

Patent attorney

McDonald Hopkins LLC

Chicago, IL · 60654

312-642-6733

Ronald Bruce Coolley

Reg. 27187

Patent attorney

Lake Forest, IL · 60045

847-295-5847

John P Cooney

Reg. 35846

Patent attorney

Cooney Corso & Moynihan LLC

Downers Grove, IL · 60515

630-675-2828

Gordon Russell Coons

Reg. 20821

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

Marc S Cooperman

Reg. 34143

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

Duane Allen Coordes

Reg. 27531

Patent attorney

Rock Island, IL · 61201

309-787-6648

Trevor K Copeland

Reg. 50292

Patent attorney

Brinks Gilson & Lione

Chicago, IL · 60611

312-222-8104

Palmer C. Corbett

Reg. 78675

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2483

Johanna Marie Corbin

Reg. 51582

Patent agent

AbbVie

North Chicago, IL · 60064

847-935-7956

Ashley Taylor Corbitt

Reg. 69017

Patent attorney

Allstate Insurance Company

Northbrook, IL · 60062

847-402-1094

Helen S Cordell

Reg. 33299

Patent attorney

Yorkville, IL · 60560

630-553-2810

Allison M Corder

Reg. 50545

Patent attorney

Valauskas Corder LLC

Chicago, IL · 60606

312-673-0360

John W Cornell

Reg. 30619

Patent attorney

K&L Gates LLP

Chicago, IL · 60602

312-807-4209

Robert M Cortez

Reg. 60813

Patent agent

Darien, IL · 60561

630-968-5217

Carrie W Cotter

Reg. 47502

Patent attorney

Strellis & Field, Chartered

Chicago, IL · 60654

312-201-0000

John H Coult

Reg. 22338

Patent attorney

Chicago, IL · 60657

773-549-6544

Steven B Courtright

Reg. 40966

Patent agent

thyssenkrupp North America, Inc.

Chicago, IL · 60604

312-525-2731

Ashley M. Cowie

Reg. 79868

Patent agent

Michael Best & Friedrich LLP

Chicago, IL · 60606

312-596-5844

Benjamin L. Cox

Reg. 83540

Patent agent

The University of Chicago

Chicago, IL · 60615

608-469-4846

Jeffrey M Cox

Reg. 50695

Patent attorney

Law Offices of Jeffrey M. Cox

Park Ridge, IL · 60068

847-209-6761

Pamela L Cox

Reg. 51584

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Paul C Craane

Reg. 38851

Patent attorney

Cook Alex Ltd.

Chicago, IL · 60606

312-334-8514

Corey M Crafton

Reg. 56895

Patent agent

Archer-Daniels-Midland Company

Decatur, IL · 62526

217-451-8674

Maureen M Craig

Reg. 74987

Patent attorney

Lombard, IL · 60148

773-759-2094

William J. Craig

Reg. 79984

Patent agent

Springfield, IL · 62704

217-412-9840

Samantha T. Craighead

Reg. 84253

Patent agent

Urbana, IL · 61801

614-905-1780

Lawrence Jay Crain

Reg. 31497

Patent attorney

Greer Burns & Crain LTD

Chicago, IL · 60606

312-987-4002

Brian P Crannell

Reg. 52777

Patent attorney

Knowles Corporation

Itasca, IL · 60143

630-250-5100

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.