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, Flener IP Law, and Trading Technologies International, Inc.

Top cities in Illinois

All practitioners in Illinois

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

James A Flight

Reg. 37622

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Erik B Flom

Reg. 41021

Patent attorney

Chicago, IL · 60616

312-949-9544

Jacob R. Florsheim

Reg. 83330

Patent agent

Foley & Lardner LLP

Chicago, IL · 60654

312-832-4314

Kevin M Flowers

Reg. 44684

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Louis E Fogel

Reg. 54731

Patent attorney

Fish & Richardson PC

Chicago, IL · 60606

612-335-5070

Karen M Folan

Reg. 84499

Patent agent

Chicago Ridge, IL · 60415

708-420-6598

Austin J Foley

Reg. 42543

Patent attorney

Baxter Healthcare Corporation

Deerfield, IL · 60015

224-948-4262

James R Foley

Reg. 39979

Patent attorney

Clark Hill PLC

Chicago, IL · 60601

312-985-5900

Jennifer O Foley

Reg. 65643

Patent agent

Libertyville, IL · 60048

847-367-4212

James K Folker

Reg. 37538

Patent attorney

Greer Burns and Crain, LTD

Chicago, IL · 60606

312-360-0080

Robert J Follett

Reg. 39566

Patent attorney

Videojet. Inc

Wood Dale, IL · 60191

630-694-3279

James T. Fondriest

Reg. 68152

Patent agent

The Kraft Heinz Company

Chicago, IL · 60601

847-646-3016

Joseph J. Forchetti

Reg. 82657

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

312-423-3473

Kyle A Forgue

Reg. 71457

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60606

312-214-4841

Sydney N. Forsander

Reg. 81199

Patent attorney

Husch Blackwell LLP

Chicago, IL · 60606

312-985-8257

George W. Foster

Reg. 74781

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

630-677-6098

Trevor J C Foster

Reg. 80560

Patent attorney

Quarles & Brady LLP

Chicago, IL · 60654

312-715-5017

Dant T Foulk

Reg. 52907

Patent attorney

Chicago, IL · 60613

773-549-4610

David Brian Fournier

Reg. 51696

Patent attorney

Perkins Coie LLP

Chicago, IL · 60603-5559

312-324-8643

Deirdre A Fox

Reg. 59687

Patent attorney

Chicago, IL · 60611

312-335-0591

Erin J Fox

Reg. 52261

Patent attorney

Glenview, IL · 60025

224-661-7812

Katherine J Fox

Reg. 74613

Patent attorney

Chicago, IL · 60618

702-379-7235

Jonathan M Francis

Reg. 72479

Patent attorney

Law Office of Jonathan M Francis

Chicago, IL · 60647

312-834-4170

Matthew C. Francis

Reg. 80236

Patent agent

Michael Best & Friedrich

Chicago, IL · 60606

708-703-1060

Anthony J. Frank· II

Reg. 84047

Patent agent

Arlington Heights, IL · 60004

847-830-7826

J William Frank· III

Reg. 25626

Patent attorney

McCracken & Gillen

Oak Brook, IL · 60523

630-286-7600

William H Frankel

Reg. 30337

Patent attorney

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4200

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.