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 Jones Day, Marshall, Gerstein & Borun LLP, and Kirkland & Ellis LLP.

Top cities in Illinois

All practitioners in Illinois

Elliot C Mendelson

Reg. 42878

Patent agent

N. Barrington, IL · 60010

312-375-7844

William K Merkel

Reg. 40725

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Joel R Merkin

Reg. 58600

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Louay K. Meroueh

Reg. 81304

Patent attorney

Chicago, IL · 60661

313-909-0799

Ayhan E. Mertogul

Reg. 63977

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602-4378

312-977-9230

Jeffrey S. Messing

Reg. 81690

Patent attorney

Jones Day

Chicago, IL · 60606

312-269-1542

Robert T Metz

Reg. 55928

Patent agent

Tinley Park, IL · 60477

708-532-3761

David R Metzger

Reg. 32919

Patent attorney

Dentons US LLP

Chicago, IL · 60606-1080

312-876-8000

Jonathan Paul Meyer

Reg. 30477

Patent attorney

Motorola Solutions, Inc.

Schaumburg, IL · 60196

847-538-3268

Kathleen A Meyer

Reg. 66006

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8167

Emily Miao

Reg. 35285

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Brian R Michalek

Reg. 65816

Patent attorney

Saul Ewing Arnstein & Lehr

Chicago, IL · 60601

312-876-7836

John M Michalik

Reg. 56914

Patent attorney

Jones Day

Chicago, IL · 60601-1692

312-269-4215

Randy R Micheletti

Reg. 54310

Patent attorney

Incubate IP

Glen Ellyn, IL · 60137

312-600-5412

Michael W Mihm

Reg. 34222

Patent attorney

Mihm Legal Services

Rock Island, IL · 61201

309-236-6854

Danka Milic

Reg. 73189

Patent attorney

SpencePC

Chicago, IL · 60611

312-637-3494

Carling D. Miller

Reg. 84415

Patent attorney

Riverwoods, IL · 60015

847-997-2388

Charles L Miller

Reg. 43805

Patent attorney

Banner & Witcoff, Ltd

Chicago, IL · 60606

312-715-1000

Christian B Miller

Reg. 71620

Patent attorney

Wood Phillips

Chicago, IL · 60661

312-876-2108

Laura Beth Miller

Reg. 37680

Patent attorney

Brinks Gilson & Lione

Chicago, IL · 60611

312-321-4715

Robert Allen Miller

Reg. 26956

Patent attorney

RAMiller Law

Northbrook, IL, IL · 60062

262-880-5991

Scott M Miller

Reg. 62967

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

312-754-9646

Stephen M Miller

Reg. 40728

Patent attorney

J. Sterling Morton West High School

Berwyn, IL · 60402

Thomas A Miller

Reg. 40091

Patent attorney

Miller, Matthias & Hull

Chicago, IL · 60606

312-977-9902

Thomas V Miller

Reg. 42002

Patent attorney

Motorola Mobility, Inc.

Chicago, IL · 60654

224-766-0500

William B Miller

Reg. 32922

Patent attorney

Oakley, IL · 62501

217-358-4058

Andrew W. Mills

Reg. 82762

Patent agent

Chicago, IL · 60607

309-339-3797

Kelsey L Milman

Reg. 42895

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

815-349-8578

Milan Milosevic

Reg. 42005

Patent attorney

SRAM Corporation

Chicago, IL · 60642

312-664-3506

Michael Edward Milz

Reg. 34880

Patent attorney

Crowell & Moring

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?

2,889 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.