Illinois

Patent attorneys in Illinois

Illinois hosts 2,889 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 Abbott Laboratories, McDonnell Boehnen Hulbert & Berghoff LLP, and Marshall, Gerstein & Borun LLP.

Top cities in Illinois

All practitioners in Illinois

Gabryleda Ferrari-Dileo

Reg. 55174

Patent attorney

Abbott Laboratories

Abbott Park, IL · 60064

847-935-4314

Mary R. Fetter

Reg. 82635

Patent agent

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Lilian Y Ficht

Reg. 64514

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Robert W Fieseler

Reg. 31826

Patent attorney

Corridor Law Group, P.C

Naperville, IL · 60563

630-417-7553

John G Fijolek

Reg. 57162

Patent agent

CFGnet

Naperville, IL · 60563

630-430-4951

Thomas J Filarski

Reg. 31612

Patent attorney

Steptoe & Johnson LLP

Chicago, IL · 60606

312-577-1300

Paul J Filbin

Reg. 51677

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

Sergio D. Filice

Reg. 59727

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Paul George Fina

Reg. 79133

Patent attorney

Yorkville, IL · 60560

630-277-3162

Marc E Fineman

Reg. 41746

Patent attorney

Levenfeld Pearlstein, LLC

Chicago, IL · 60606

312-476-7558

Karl R Fink

Reg. 34161

Patent attorney

Fitch, Even,Tabin, Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Katherine L Fink

Reg. 62147

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

Herbert H Finn

Reg. 38139

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601

312-456-8427

Maurice Edward Finnegan· III

Reg. 54099

Patent attorney

Glenview, IL · 60025

224-661-7791

Julie A. Fischer

Reg. 81577

Patent agent

Chicago, IL · 60657

262-527-1502

Ryan J Fischer

Reg. 55180

Patent agent

Chicago, IL · 60625

760-492-7797

Bart A Fisher

Reg. 55181

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

309-675-6341

Steven L. Fisher-Stawinski

Reg. 67950

Patent attorney

IBM Corporation

SCHAUMBURG, IL · 60173

312-715-7376

Harriet J. Fitzgerald

Reg. 84878

Patent agent

Chicago, IL · 60610

620-482-2126

Jennifer L Fitzgerald

Reg. 39976

Patent attorney

Freeborn & Peters, LLP

Chicago, IL · 60606

312-360-6585

Ryan T. Fitzgerald

Reg. 79303

Patent attorney

Crowell & Moring

Chicago, IL · 60611

312-321-4200

Katherine J Fitzpatrick

Reg. 61596

Patent attorney

WM. Wrigley Jr. Company

Chicago, IL · 60642

312-794-6245

Thomas R Fitzsimons

Reg. 40607

Patent attorney

Greer Burns and Crain, Ltd.

Chicago, IL · 60606

312-360-0080

John Francis Flannery

Reg. 19759

Patent attorney

Fitch, Even, Tabin, & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Donald G Flaynik· Jr

Reg. 30836

Patent attorney

Channahon, IL · 60410

815-467-4333

Michael H Fleck

Reg. 70958

Patent attorney

Riley Safer Holmes & Cancila LLP

Chicago, IL · 60603

312-471-8766

Margaret R. Fleetwood

Reg. 70876

Patent attorney

Chroma Medicine, Inc.

Chicago, IL · 02215

708-601-0767

Zareefa B Flener

Reg. 52896

Patent attorney

Flener IP Law

Chicago, IL · 60602

312-724-8874

Joseph W Flerlage

Reg. 52897

Patent attorney

Trading Technologies International, Inc

Chicago, IL · 60606

312-476-1000

Gist Fleshman

Reg. 46703

Patent attorney

Peoria, IL · 61602

309-671-3190

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?

2,889 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.