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 Marshall, Gerstein & Borun LLP, McAndrews, Held & Malloy, and Knechtel Demeur & Samlan.

Top cities in Illinois

All practitioners in Illinois

Conor S Hunt

Reg. 69942

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

312-474-6300

Thomas E Hunt

Reg. 53049

Patent agent

Chicago, IL · 60625

773-506-6506

David J Hurley

Reg. 46786

Patent attorney

Knechtel Demeur & Samlan

Chicago, IL · 60661

312-655-9900

John Michael Husar

Reg. 54887

Patent agent

Komatsu America Corp.

Peoria, IL · 61603

309-672-7428

Judith K Huszar

Reg. 74557

Patent agent

Chicago, IL · 60631-1058

312-375-4872

Jeffrey B Huter

Reg. 41086

Patent attorney

McAndrews, Held & Malloy

Chicago, IL · 60661

312-238-8600

Gerri E Hutson

Reg. 72720

Patent agent

Neal, Gerber & Eisenburg LLp

Chicago, IL · 60602

312-269-5328

Sharon A Hwang

Reg. 39717

Patent attorney

Buchanan Ingersoll & Rooney, PC

Chicago, IL · 60606

312-261-8765

Mark J Hyman

Reg. 46789

Patent attorney

AbbVie Inc.

North Chicago, IL · 60064

847-937-8941

Dasha Ignatova

Reg. 84651

Patent agent

Arlington Heights, IL · 60004

847-913-3963

David I Imrem

Reg. 69913

Patent agent

Chicago, IL · 60610-1080

847-334-0046

Kareem Mohammed Irfan

Reg. 32326

Patent attorney

Cranes Software International Limited

Chicago, IL · 60606

847-867-4304

Zuha S Irfan

Reg. 72387

Patent attorney

Lee Sullivan Shea & Smith

Chicago, IL · 60661

312-754-8998

Robert J Irvine· III

Reg. 41865

Patent attorney

Invention Mine LLC

Naperville, IL · 60563

312-834-4334

Barry Frederick Irwin

Reg. 36557

Patent attorney

Irwin IP, LLC

Burr Ridge, IL · 60527

630-756-3101

Tomoko Itoga

Reg. 56496

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Eric B Ives

Reg. 50928

Patent agent

University of Illinois Urbana-Champaign,

Urbana, IL · 62801

217-300-5034

Steven Ivy

Reg. 70878

Patent attorney

Steven Ivy Group

Schaumburg, IL · 60173

630-440-8482

Mark H Izraelewicz

Reg. 47678

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

William E Jacklin

Reg. 64894

Patent attorney

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

Amanda C Jackson

Reg. 77549

Patent attorney

McAndrews, Held & Malloy

Chicago, IL · 60661

312-775-8141

Brent C Jacobs

Reg. 64068

Patent attorney

Chicago, IL · 60601-7520

312-285-0035

Jeffrey K Jacobs

Reg. 44798

Patent attorney

Molex

Lisle, IL · 60532

630-718-5522

Robert S Jacobson

Reg. 77550

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

312-423-3432

Kenneth Edward Jaconetty

Reg. 32508

Patent attorney

Takeda Pharmaceuticals U.S.A.

Deerfield, IL · 60015

224-554-5494

Jerold Alan Jacover

Reg. 26284

Patent attorney

Foley & Laroner

Chicago, IL · 60654-5313

312-832-5117

Herve R Jacquiau

Reg. 64976

Patent attorney

Hahn Losser & Parks LLP

Chicago, IL · 60606

312-637-3022

James Joseph Jagoda

Reg. 33250

Patent attorney

Bishop Diehl & Lee, Ltd.

Schaumburg, IL · 60173

847-969-9123

Kraig A Jakobsen

Reg. 64520

Patent attorney

Saint Charles, IL · 60175

630-360-9200

Robert Vernon Jambor

Reg. 23080

Patent attorney

Leydig, Voit & Mayer, LTD

Chicago, IL · 60601

312-616-5600

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.