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 Marshall, Gerstein & Borun LLP, Lesley A. Wallerstein, LLC, and Husch Blackwell Sanders Welsh & Katz.

Top cities in Illinois

All practitioners in Illinois

Lesley A Wallerstein

Reg. 39812

Patent attorney

Lesley A. Wallerstein, LLC

Deerfield, IL · 60015

847-912-3553

Louise T Walsh

Reg. 45195

Patent attorney

Husch Blackwell Sanders Welsh & Katz

Chicago, IL · 60606

312-526-1613

Eric R. Waltmire

Reg. 61122

Patent attorney

The Law Office of Randall T. Erickson, P.C.

Wheaton, IL · 60187

630-665-9404

Laura R Wanek

Reg. 53737

Patent attorney

Greer, Burns & Crain, Ltd.

Chicago, IL · 60606

312-360-0080

Jason Wang

Reg. 81889

Patent agent

Wadsworth, IL · 60083

224-717-0296

Minqin Wang

Reg. 54610

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Nicole J. Wang

Reg. 80017

Patent agent

Foley & Lardner LLP

Chicago, IL · 60654

832-573-0356

Qixuan Wang

Reg. 82273

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-423-3443

Rich Shiaw-Lun Wang

Reg. 68552

Patent agent

Palatine, IL · 60067

847-702-2670

Sen Wang

Reg. L1296

Limited recognition

Venture Partner, LLC

Chicago, IL · 60611

312-840-8228

Shanping Wang

Reg. 53739

Patent agent

Rosenbaum and Assocs

Chicago, IL · 60611

312-397-0303

Shen Wang

Reg. 71847

Patent agent

ARCH and LAKE LLP

Chicago, IL · 60601

636-236-5390

Weiwei Wang

Reg. 82601

Patent agent

Quarles & Brady LLP

Chicago, IL · 60606

312-715-2765

Zihao Wang

Reg. 902887

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

872-444-4174

Michael J Ward

Reg. 37960

Patent agent

AbbVie Inc.

North Chicago, IL · 60064-1802

847-938-3490

Todd D Ware

Reg. 54888

Patent agent

Baxter Healthcare Corporation

McGaw Park, IL · 60085

847-473-6072

Andrew C Warnecke

Reg. 43238

Patent attorney

Jenkens & Gilchrist

Chicago, IL · 60606

312-425-3900

Michael O Warnecke

Reg. 24345

Patent attorney

Perkins Coie LLP

Chicago, IL · 60603

312-324-8549

Alastair J Warr

Reg. 47166

Patent attorney

Fisher Broyles LLP

Chicago, IL · 60601

317-407-5280

Charles L Warren

Reg. 27407

Patent attorney

Carman Patti Law Group

Chicago, IL · 60602

312-346-2800

Raymond J Warren

Reg. 30813

Patent attorney

Motorola Mobility LLC

Chicago, IL · 60654

224-338-9343

James George Warriner

Reg. 72833

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

312-474-6300

Brittany A.M Washington

Reg. 76680

Patent attorney

Morgan, Lewis & Bockius LLP

Chicago, IL · 60601

312-324-1104

Hisashi D Watanabe

Reg. 37465

Patent attorney

Siemens

Buffalo Grove, IL · 60089

847-941-3401

Larry G Waterfield

Reg. 61729

Patent agent

Caterpillar, Inc.

Peoria, IL · 61629

309-675-8097

Justin G. Watrobka

Reg. 59284

Patent attorney

Palatine, IL · 60067

708-261-1885

John F Watson

Reg. 37962

Patent attorney

Craig & Craig, LLC

Mattoon, IL · 61938

217-234-6481

Zachary D. Wawrzyniakowski

Reg. 79781

Patent attorney

Faegre Drinker Biddle & Reath LLP

Chicago, IL · 60606

312-569-1139

Brian Keith Wax

Reg. 48810

Patent attorney

Lake Forest, IL · 60045

847-234-4559

Philip A. Wdowiak

Reg. 80140

Patent agent

Benesch

Chicago, IL · 60606

312-273-1620

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.