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 Lee Sullivan Shea & Smith LLP, Applied Thin films Inc., and Olson & Cepuritis, Ltd..

Top cities in Illinois

All practitioners in Illinois

Wallace L Oliver· Jr

Reg. 27368

Patent attorney

Applied Thin films Inc.

Skokie, IL · 60077

847-436-1094

Arne M Olson

Reg. 30203

Patent attorney

Olson & Cepuritis, Ltd.

Chicago, IL · 60606-3103

312-580-1180

Ragnar Richard Olson

Reg. 58684

Patent attorney

Global IP Law Group, LLC

Chicago, IL · 60603

312-241-1500

Thomas Evan Omholt

Reg. 37052

Patent agent

Cabot Microelectronics Corporation

Aurora, IL · 60504

630-375-2033

Jordan T. One

Reg. 74085

Patent agent

Greenberg Traurig, LLP

Chicago, IL · 60601-1732

312-456-6587

Oliver T Ong

Reg. 58456

Patent attorney

Marshall, Gerstein & Borun, LLP

Chicago, IL · 60606

312-474-6300

Micah R Onixt

Reg. 47834

Patent attorney

Piper Marbury Rudnick and Wolfe

Chicago, IL · 60601

312-368-2141

Anna A. Onley

Reg. 73876

Patent attorney

Chicago, IL · 60625

773-960-2476

Neil Randall Ormos

Reg. 35309

Patent attorney

Arlington Heights, IL · 60005

224-366-7104

Brian Robert Orr

Reg. 56694

Patent attorney

Mokena, IL · 60448

815-485-7408

Andrea K Orth

Reg. 68000

Patent attorney

GrowIP Law Group LLC

Barrington, IL · 60010

312-823-6864

David D. Osinski

Reg. 82060

Patent agent

Hanley, Flight, and Zimmerman, LLC

Chicago, IL · 60606

312-580-1020

David N Oskin

Reg. 58863

Patent attorney

Keeper Security, Inc.

Chicago, IL · 60607

708-515-4062

John J Oskorep

Reg. 41234

Patent attorney

Chicago, IL · 60611

312-222-1860

Sherri L Oslick

Reg. 52087

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Michael Robert Osterhoff

Reg. 46973

Patent attorney

K&L Gates LLP

Chicago, IL · 60602-4207

312-807-4205

Jeffrey A Ostrom

Reg. 67146

Patent attorney

Bourbonnais, IL · 60914

815-936-9373

Stephen R Otis

Reg. 64226

Patent attorney

Otis Patent Law

Highland Park, IL · 60035

224-436-9787

Frederick J Otto

Reg. 31553

Patent attorney

Otto & Associates

Park Ridge, IL · 60068

847-698-1160

James Warren Ove· Jr

Reg. 28745

Patent attorney

Law Offices of James Ove Jr

Naperville, IL · 60563

312-300-6761

Philip F. Oweimrin

Reg. 81387

Patent agent

Chicago, IL · 60646

773-595-0631

Patrick J. Owens

Reg. 80250

Patent attorney

Arnold & Porter

Chicago, IL · 60602

312-583-2441

Dallin W. Packard

Reg. 81817

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

312-754-9298

Sun Y Pae

Reg. 61401

Patent attorney

Klintworth & Rozenblat IP LLP

Chicago, IL · 60612-1577

773-570-3330

Preetam B. Pagar

Reg. 57684

Patent attorney

Motorola Solutions, Inc.

Chicago, IL · 60661

847-350-8796

Fatimeh D Pahlavan

Reg. 78064

Patent attorney

Legal Intelligence to Entrepreneurs LLC

Chicago, IL · 60603

312-620-1406

Chad A Pahnke

Reg. 63568

Patent attorney

McAndrews, Held, & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Alaina Y. Pak

Reg. 80368

Patent agent

Chicago, IL · 60606

240-370-6796

Ekaterina Pak

Reg. 78196

Patent agent

Chicago, IL · 60611

201-281-9042

Jaeyoung Pak

Reg. 72428

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

312-754-9232

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.