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 Brinks Hofer Gilson & Lione, Hinshaw & Culberston LLP, and Marshall, Gerstein & Borun LLP.

Top cities in Illinois

All practitioners in Illinois

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

Brian T May

Reg. 46907

Patent attorney

Mayer Brown and Platt

Chicago, IL · 60603

312-782-0600

Steven A May

Reg. 44912

Patent attorney

Motorola Solutions, Inc.

Chiago, IL · 60618

773-477-2341

Alejandro Mayagoitia Hernandez

Reg. 84392

Patent agent

MBHB

Chicago, IL · 60606

312-913-3390

Andrew J Mayer

Reg. 57873

Patent attorney

Downers Grove, IL · 60515

630-776-0279

Gregory Charles Mayer

Reg. 38238

Patent attorney

Becton, Dickinson and Company

Vernon Hills, IL · 60061

602-830-5283

Israel S Mayergoyz

Reg. 47778

Patent agent

Jones Day

Chicago, IL · 60601-1692

312-269-1572

Michael Christopher Mayo

Reg. 38545

Patent attorney

Baxalta US Inc.

Bannockburn, IL · 60015

224-940-2136

Susan V Mazurek

Reg. 77749

Patent attorney

Chicago, IL · 60606

000-000-0000

Michael P Mazza

Reg. 34092

Patent attorney

Michael P. Mazza, LLC

Glen Ellyn, IL · 60137

630-858-5071

Deanne M Mazzochi

Reg. 50158

Patent attorney

Rakoczy Molino Mazzochi Siwik LLP

Chicago, IL · 60610

312-222-6305

Eric P McAlpine

Reg. 46908

Patent attorney

Groupon, Inc.

Chicago, IL · 60137

312-662-6512

Paul W McAndrews

Reg. 62966

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Peter John McAndrews

Reg. 38547

Patent attorney

McAndrew Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Scott Patrick McBride

Reg. 42853

Patent attorney

McAndrews Held and Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Robert Alan McCann

Reg. 35606

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

708-532-1800 X 81302

James M McCarthy

Reg. 39296

Patent attorney

Norvell IP llc

Chicago, IL · 60604

773-729-2239

Timothy M McCarthy

Reg. 42855

Patent attorney

Chicago, IL · 60601

312-985-5561

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.