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 Edward D Gilhooly & Associates, Klintworth & Rozenblat IP LLP, and LanzaTech, Inc..

Top cities in Illinois

All practitioners in Illinois

Robert E Giffels

Reg. 39994

Patent agent

Mokena, IL · 60448

708-479-7666

Edward D Gilhooly

Reg. 25004

Patent attorney

Edward D Gilhooly & Associates

Chicago, IL · 60604

312-362-1734

Gary R Gillen

Reg. 35157

Patent attorney

Klintworth & Rozenblat IP LLP

Chicago, IL · 60612-1577

630-286-7624

Chad M Gilles

Reg. 60590

Patent attorney

Chicago, IL · 60605

321-271-5452

James Weston Gilles

Reg. 79558

Patent agent

Northbrook, IL · 60062

623-986-7286

Brian M. Gillespie

Reg. 76776

Patent attorney

LanzaTech, Inc.

Skokie, IL · 60077

847-324-2478

Jeanne M Gills

Reg. 44458

Patent attorney

Foley & Lardner LLP

Chicago, IL · 60610

312-755-2583

Thomas H. Gilman

Reg. 66053

Patent agent

Spring Grove, IL · 60081

815-245-4531

Aaron V Gin

Reg. 69068

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-3360

Charles A Ginnings

Reg. 62706

Patent attorney

Nelson Bumgardner Conroy PC

Burr RIdge, IL · 60527

708-675-1583

Eric J. Ginsburg

Reg. 60662

Patent agent

University of Chicago

Chicago, IL · 60637

773-834-0746

Kelly A. Giordano

Reg. 79264

Patent agent

Chicago, IL · 60622

817-705-1177

Jonathan E Giroux

Reg. 66639

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601-1732

312-456-1009

Ryan M Gleitz

Reg. 62164

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-854-8369

Hugh W Glenn· Jr

Reg. 24892

Patent attorney

Willowbrook, IL · 60527

630-887-1642

Daniel J Glitto

Reg. 58996

Patent attorney

Zebra Technologies Corporation

Lincolnshire, IL · 60069

847-955-5342

Thomas M. Gniot

Reg. 68998

Patent attorney

Barack Ferrazzano Kirschbaum

Chicago, IL · 60606

312-984-3100

Vincent Joseph Gnoffo

Reg. 44714

Patent attorney

Benesch, Friedlander, Coplan & Aronoff LLP

Chicago, IL · 60606

312-212-4963

Grace Anne Godby

Reg. 902873

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

224-595-6732

Brian D. Goddard

Reg. 59368

Patent agent

Cardinal Intellectual Property, Inc.

Evanston, IL · 60201

847-905-7122

James F Goedken

Reg. 44715

Patent attorney

Faegre Baker Daniel LLP

Chicago, IL · 60606

312-356-5058

Jennifer P Goetsch

Reg. 49068

Patent attorney

Marshall Gerstein and Borun

Chicago, IL · 60606

312-474-6300

Joseph H Golant

Reg. 24210

Patent attorney

Law Offices of Joseph Golant

Riverwoods, IL · 60015

847-363-3119

Mark Goldberg

Reg. 29921

Patent attorney

Paschall & Maas Law Office

Arlington Heights, IL · 60004

872-810-2994

James B Golden

Reg. 45773

Patent agent

Goldens M & I

Peoria, IL · 61604

309-685-8166

Larry I Golden

Reg. 29068

Patent attorney

Buffalo Grove, IL · 60089

847-302-1010

Daniel B Goldman

Reg. 64640

Patent attorney

Chicago, IL · 60614

847-650-2147

Kenneth M Goldman

Reg. 34174

Patent attorney

Massey & Gail LLP

Chicago, IL · 60602

312-283-1590

Michael S. Golenson

Reg. 66104

Patent attorney

Masuda, Funai, Eifert & Mitchell, Ltd.

Chicago, IL · 60601-1262

312-245-7529

Anil Gollahalli

Reg. 48996

Patent attorney

Big Ten Conference

Rosemont, IL · 60018

405-301-3787

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.