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 AbbVie Inc., McAndrews Held and Malloy LTD, and Husch Blackwell LLP.

Top cities in Illinois

All practitioners in Illinois

Steven Weseman

Reg. 41372

Patent attorney

Arlington Heights, IL · 60004

847-846-6202

William M Wesley

Reg. 26521

Patent attorney

McAndrews Held and Malloy LTD

Chicago, IL · 60661

312-775-8000

David A West

Reg. 39418

Patent agent

Streamwood, IL · 60107

630-837-6553

Marc Richard Wezowski

Reg. 73825

Patent attorney

Husch Blackwell LLP

Chicago, IL · 60622

312-655-1500

Joseph J. Whang

Reg. 73886

Patent attorney

Wood Dale, IL · 60191

630-930-7031

George F Wheeler

Reg. 28766

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Nicholas K. Wheeler

Reg. 79554

Patent attorney

Irwin IP, LLC

Chicago, IL · 60606

630-441-2787

John J Whelan

Reg. 76200

Patent attorney

Klein Tools

Lincolnshire, IL · 60069

847-821-3289

Marc J Whipple

Reg. 40224

Patent attorney

Marc Whipple

Algonquin, IL · 60102

708-846-1065

David J White

Reg. 53766

Patent attorney

Seyfarth Shaw LLP

Chicago, IL · 60603

312-460-5318

Elizabeth D. White

Reg. 83791

Patent agent

Quarles and Brady

Chicago, IL · 60606

312-715-2750

Gerald K White

Reg. 26611

Patent attorney

Gerald K White and Assocs PC

Homer Glen, IL · 60491-8154

904-484-7661

Jason C White

Reg. 42223

Patent attorney

Brinks Hofer Gilson & Lione

Chicago, IL · 60611

312-321-4200

Michael L White

Reg. 39421

Patent attorney

Glenview, IL · 60025

847-729-3561

Stephanie N. White

Reg. 74898

Patent attorney

Bishop Diehl & Lee, LTD.

Schaumburg, IL · 60173

847-969-9123

Daniel L. Whitenack

Reg. 73278

Patent agent

Marshall Gerstein & Borun LLP

Chicago, IL · 60606

312-423-3440

Brent K. Whitlock

Reg. 61371

Patent attorney

Brent K. Whitlock, Ph.D., Attorney at Law

NAPERVILLE, IL · 60563

866-403-8690

Paul E Wiedeman

Reg. 62784

Patent agent

AbbVie Inc.

North Chicago, IL · 60064

847-937-9532

Mark E Wiemelt

Reg. 36055

Patent attorney

Law Offices Of Mark E Wiemelt, PC

Chicago, IL · 60603

312-372-7664

Richard C Wilbur· Jr

Reg. 36056

Patent attorney

Caterpillar INC

Peoria, IL · 61629

309-675-5847

Emma L. Wilfong

Reg. 82096

Patent attorney

Sidley Austin LLP

Chicago, IL · 60603

312-853-2666

Todd R Wilkinson

Reg. 55730

Patent attorney

The GSI Group, LLC

Assumption, IL · 62510

217-226-5961

Allison M Williams

Reg. 59840

Patent attorney

Husch Blackwell

Chicago, IL · 60606

312-526-1515

James Henry Williams· III

Reg. 56883

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

708-532-1800 X 81302

Thomas E Williams

Reg. 54735

Patent attorney

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4200

Allison M. Williamson

Reg. 76889

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

512-538-5615

Amanda Scott Williamson

Reg. 73683

Patent agent

Morgan, Lewis & Bockius LLP

Chicago, IL · 60601

312-324-1450

Kaylee M. Willis

Reg. 77775

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-935-7954

Mark R Willis

Reg. 60577

Patent attorney

UOP LLC

Des Plaines, IL · 60017-5017

847-391-2259

Amy E. Wilson

Reg. 54704

Patent attorney

Baxalta US Inc.

Bannockburn, IL · 60015

224-940-4636

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.