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 McAndrews, Held & Malloy, Ltd., Jones Day, and Panduit Corp..

Top cities in Illinois

All practitioners in Illinois

John Addison Marlott

Reg. 37031

Patent attorney

Jones Day

Chicago, IL · 60606

312-269-4236

Christopher K Marlow

Reg. 55427

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

708-532-1800 X81302

David J Marr

Reg. 32915

Patent attorney

Clark Hill PLC

Chicago, IL · 60601

312-955-5558

Matthew E. Marrone

Reg. 68431

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Diane Lyn Marschang

Reg. 35600

Patent attorney

Kenilworth, IL · 60043

847-251-3510

Robert Louis Marsh

Reg. 25894

Patent attorney

Wheaton, IL · 60187

630-681-7500

Alice O Martin

Reg. 35601

Patent attorney

Barnes & Thornburg, LLP

Chicago, IL · 60606

312-214-8316

Allyson M. Martin

Reg. 72610

Patent attorney

Greer, Burns & Crain Ltd.

Chicago, IL · 60606

312-987-2914

Eric P Martin

Reg. 48280

Patent attorney

Wilmette, IL · 60091

847-256-2362

Matthew Eric Martin

Reg. 53274

Patent agent

Foley & Lardner LLP

Chicago, IL · 60610

312-832-4559

Michael Blain Martin

Reg. 37521

Patent attorney

MB MARTIN LLC

Aurora, IL · 60598

630-605-6782

Richard W Martin

Reg. 72543

Patent attorney

McDonnell, Boehnen, Hulbert & Berghoff

Chicago, IL · 60606

312-913-2101

Ronald B Martin

Reg. 55431

Patent agent

Carol Stream, IL · 60188

630-309-2464

Brittany M. Martinez

Reg. 73118

Patent attorney

Ambir Technology, Inc.

Wood Dale, IL · 60191

708-704-6393

Edward Anthony Mas· II

Reg. 37179

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Martin S Masar· III

Reg. 62007

Patent attorney

Katten Muchin Rosenman LLP

Chicago, IL · 60661-3693

312-902-5616

Adam Hugh Masia

Reg. 35602

Patent attorney

Neal, Gerber & Eisenberg, LLP

Chicago, IL · 60602

312-269-8048

Michael Adam Massing

Reg. 51342

Patent attorney

Brinks Hofer Gilson & Lione

Chicago, IL · 60611

725-600-2802

Roger M Masson

Reg. 58796

Patent attorney

Hinshaw & Culberston LLP

Chicago, IL · 60606

312-704-3516

John P. Masters

Reg. 76259

Patent agent

Buffalo Grove, IL · 60089

630-359-7456

Shannon Hughes Mastick

Reg. 74887

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

224-805-6800

Khalid S. Matariyeh

Reg. 80421

Patent attorney

Orland Park, IL · 60467

708-407-6503

Olivia C Mathews

Reg. 80801

Patent agent

Chicago, IL · 60654

512-657-3407

Vikram A. Mathrani

Reg. 62885

Patent attorney

Honigman LLP

Chicago, IL · 60654

312-701-9300

Charles R Mattenson

Reg. 30660

Patent attorney

Strategic Intellectual Property Specialists

Glencoe, IL · 60022

847-421-5126

Brent E Matthias

Reg. 41974

Patent attorney

Miller, Matthias & Hull

Chicago, IL · 60606

312-977-9902

Brian Michael Mattson

Reg. 35018

Patent attorney

Patents & Tms, P.C.

Chicago, IL · 60647

773-772-6009

Kenneth A. Matuszewski

Reg. 74791

Patent attorney

Rabicoff Law LLC

Chicago, IL · 60603

708-870-5803

Charles E Maurer· III

Reg. 76658

Patent attorney

Foley & Lardner, LLP

Chicago, IL · 60654

312-832-4545

Erik S Maurer

Reg. 48648

Patent attorney

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5000

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.