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 McCaulley Law Group, Banner Witcoff, and K&L Gates, LLP.

Top cities in Illinois

All practitioners in Illinois

Richard T McCaulley· Jr

Reg. 41977

Patent attorney

McCaulley Law Group

Deer Park, IL · 60010

312-858-1105

Joseph P McCollum

Reg. 78593

Patent attorney

Banner Witcoff

Chicago, IL · 60606

312-463-5000

Kevin T McCormick

Reg. 72671

Patent attorney

K&L Gates, LLP

Chicago, IL · 60602

312-807-4335

Mark Alan McCormick

Reg. 53295

Patent attorney

Olney, IL · 62450

630-388-8797

William E McCracken

Reg. 30195

Patent attorney

McCracken & Gillen LLC

Oak Brook, IL · 60523

630-286-7600

William F McDermott

Reg. 29954

Patent attorney

Chicago, IL · 60614

312-721-7563

Frank B McDonald

Reg. 28738

Patent attorney

Miller Matthias & Hull, LLP

Chicago, IL · 60606

312-977-9902

Scott Paul McDonald

Reg. 34871

Patent attorney

Hinsdale, IL · 60521

630-207-2090

Michael P McDonough

Reg. 41981

Patent attorney

US Environmental Protection Agency

Chicago, IL · 60604

312-886-1550

Thomas C McDonough

Reg. 33734

Patent attorney

Neal, Gerber & Eisenberg, LLP

Chicago, IL · 60602

312-269-5282

Annette Michele McGarry

Reg. 34671

Patent attorney

McGarry & McGarry, LLC

Chicago, IL · 60612

312-345-4600

Michael J McGee

Reg. 43789

Patent attorney

Cook Alex McFarron Manzo Cummings

Chicago, IL · 60606

312-236-8500

Richard Joseph McGillivray

Reg. 51347

Patent attorney

Mt Zion, IL · 62549

217-412-2091

Paul M McGinley

Reg. 55443

Patent agent

CC Industries, Inc.

Chicago, IL · 60601

312-750-6675

John H McGowen· V

Reg. 79311

Patent agent

JPMorgan Chase

Chicago, IL · 60603

312-732-5177

Thomas C McGowen

Reg. 47783

Patent attorney

McGowen and McGowen PC

Wheaton, IL · 60187

630-597-7777

Timothy McGrath

Reg. 55967

Patent agent

Chicago, IL · 60622

773-252-1778

Gordon Neal McGrew

Reg. 37393

Patent agent

Wm. Wrigley Jr. Company

Chicago, IL · 60642

312-794-6015

John Joseph McGuirk

Reg. 36865

Patent attorney

Rakoczy Mollno Mazzochi Siwik

Chicago, IL · 60654

312-222-6309

Kirk M McInerney

Reg. 28970

Patent attorney

McInerney LTD/ IP Transactions Group LTD

Winnetka, IL · 60093

312-553-6940

Laura A. McJilton

Reg. 74378

Patent agent

Evenston, IL · 60202

John J McKearin

Reg. 59116

Patent agent

Hoffman Estates, IL · 60169

847-884-4933

Janice M McLain

Reg. 32367

Patent attorney

Tinley Park, IL · 60477

708-614-0372

F William McLaughlin

Reg. 32273

Patent attorney

Wood Phillips

Chicago, IL · 60661

312-876-2120

Neil B McLaughlin

Reg. 70810

Patent attorney

Rakoczy Molino Mazzochi Siwik LLP

Chicago, IL · 60654

312-222-7241

Charles M McMahon

Reg. 44926

Patent attorney

McDermott Will & Emery LLP

Chicago, IL · 60606

312-984-7641

KeVohn McMahon

Reg. 902882

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

773-682-2084

Michelle L McMullen

Reg. 52016

Patent attorney

Polsinelli PC

Chicago, IL · 60606

312-463-6303

John R McNair

Reg. 78506

Patent attorney

Winston & Strawn LLP

Chicago, IL · 60601-9703

312-558-3225

Dennis M McWilliams

Reg. 25195

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60690-2786

312-214-4801

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.