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, Nixon Peabody LLP, and Steger IP, LLC.

Top cities in Illinois

All practitioners in Illinois

Steven G Steger

Reg. 40185

Patent attorney

Steger IP, LLC

Chicago, IL · 60654

847-942-2391

Devin P. Stein

Reg. 79807

Patent attorney

Faegre Drinker Biddle & Reath LLP

Chicago, IL · 60606

312-569-1507

Roger H Stein

Reg. 31882

Patent attorney

Lake Zurich, IL · 60047

312-523-3333

Lawrence Alan Steingold

Reg. 54467

Patent attorney

Law Office of Lawrence Steingold

Buffalo Grove, IL · 60089

847-804-7988

Sally W Stemwedel

Reg. 43161

Patent agent

Stemwedel & Stemwedel

Northbrook, IL · 60062

847-559-1209

Dennis Gabriel Stenstrom

Reg. 28910

Patent attorney

Law Office of Dennis G Stenstrom

Poway, IL · 92064

858-673-7098

Robert A Stenzel

Reg. 24674

Patent attorney

RAS Associates

Arlington Heights, IL · 60005

847-255-6868

Paul B Stephens

Reg. 47970

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

James L. Stephenson

Reg. 81490

Patent attorney

EVBox North America, Inc.

Chicago, IL · 60618

773-573-7065

Martin Lloyd Stern

Reg. 28911

Patent attorney

Michael Best & Friedrich LLP

Chicago, IL · 60606

312-661-2121

Michael J Stern

Reg. 70734

Patent attorney

Chicago, IL · 60611

203-676-0166

Lauren Lee Stevens

Reg. 36691

Patent agent

Long Grove, IL · 60047

224-500-9023

Bryan David Stewart

Reg. 66941

Patent attorney

Husch Blackwell, LLP

Chicago, IL · 60606

312-526-1547

Leonard Stewart

Reg. 66440

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

309-494-4176

Thomas R Stiebel· Jr

Reg. 48682

Patent attorney

Quarles & Brady LLP

Chicago, IL · 60661

312-715-5244

Thomas Kenneth Stine

Reg. 32310

Patent attorney

Galena, IL · 61036

312-882-5397

Richard S Stockton

Reg. 50330

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

Denis B Stolyarov

Reg. 66404

Patent agent

Motorola Inc.

Libertyville, IL · 60048

847-523-8775

Andrew D Stover

Reg. 38629

Patent attorney

Benesch

Chicago, IL · 60606

312-517-9546

Brianne M. Straka

Reg. 70152

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

Chicago, IL · 60606

312-705-7400

William Albert Streff· Jr

Reg. 27397

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2126

Benjamin Fredrich Strick

Reg. 75620

Patent agent

Leydig, Voit & Mayer, Ltd.

Chicago, IL · 60601

312-616-5623

Daniel S. Stringfield

Reg. 68677

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

312-977-4400

Robert M Strom

Reg. 64240

Patent attorney

Jenner & Block LLP

Chicago, IL · 60654

312-222-9350

Allison E. Strong

Reg. 79349

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

872-271-6652

James R Stuber

Reg. 36022

Patent attorney

James R Stuber and Associates

Chicago, IL · 60656

773-693-2693

Alice C Su

Reg. 66125

Patent attorney

Akzo Nobel Services Inc.

Chicago, IL · 60607

312-544-7102

Katharine Nuehring Su

Reg. 64864

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Alexander A. Sudrzynski

Reg. 83656

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-291-0860

Barry W Sufrin

Reg. 27398

Patent attorney

Barry Sufrin

Glencoe, IL · 60011

847-544-1647

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.