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 Abbott Laboratories, McDermott, Will & Emery, LLP, and Benesch, Friedlander, Coplan & Aronoff.

Top cities in Illinois

All practitioners in Illinois

Andrew M Parial

Reg. 50382

Patent attorney

Abbott Laboratories

Abbott Park, IL · 60064

847-935-8337

Amol A. Parikh

Reg. 60671

Patent attorney

McDermott, Will & Emery, LLP

Chicago, IL · 60606

312-372-2000

Jill J. Parikh

Reg. 70565

Patent agent

Burr Ridge, IL · 60527

630-781-6973

Rachit B. Parikh

Reg. 81265

Patent attorney

Benesch, Friedlander, Coplan & Aronoff

Chicago, IL · 60606

312-212-4966

Daniel Dong-Seung Park

Reg. 37413

Patent attorney

US Dept of Energy

Argonne, IL · 60439

630-252-2308

Irwin I Park

Reg. 68865

Patent attorney

Global IP Law Group, LLC

Chicago, IL · 60603

312-241-1500

Kyoo-Chul K. Park

Reg. 84756

Patent agent

Wilmette, IL · 60091

857-366-2905

Mildred E Park

Reg. 61714

Patent attorney

Law Offices of Steven G. Lisa, Ltd.

Chicago, IL · 60603

312-912-1516

Samuel S. Park

Reg. 59656

Patent attorney

Winston & Strawn LLP

Chicago, IL · 60601

312-558-7931

W William Park

Reg. 55523

Patent attorney

William Park & Associates Ltd.

Hinsdale, IL · 60521

630-908-7652

Zion H. Park

Reg. 63912

Patent agent

Cardinal Intellectual Property

Evanston, IL · 60201

847-905-7122

J Kevin Parker

Reg. 33024

Patent attorney

Highland Park, IL · 60035

847-432-7302

Pamela A Parker

Reg. 56428

Patent attorney

Chicago, IL · 60618

303-641-0689

Timothy A Parker

Reg. 58606

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

309-675-8121

Todd S Parkhurst

Reg. 26494

Patent attorney

Partridge Partners PC

Chicago, IL · 60654

312-634-9517

Michael A Parks

Reg. 40762

Patent attorney

Thompson Coburn LLP

Chicago, IL · 60603

312-580-2237

Raymond E Parks

Reg. 26972

Patent agent

Chicago, IL · 60632

773-582-0944

Steven M. Parks

Reg. 61889

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Steven G Parmelee

Reg. 28790

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Keith D Parr

Reg. 33322

Patent attorney

Buchanan Ingersoll & Rooney PC

Chicago, IL · 60606

312-261-8733

Michael C. Parris

Reg. 74868

Patent agent

Dentons US LLP

Chicago, IL · 60606

William E Parry

Reg. 27934

Patent attorney

Hinsdale, IL · 60521

630-921-1288

James C Paschall

Reg. 36887

Patent attorney

Paschall & Associates, LLC

Arlington Heights, IL · 60004

872-810-2992

Jonathan R Pasky

Reg. 59871

Patent attorney

Pasky IP Law LLC

Chicago, IL · 60654

312-772-3510

Ronald J Pasowicz

Reg. 53438

Patent attorney

Chicago, IL · 60616-2220

312-674-0291

Thomas G Pasternak

Reg. 36990

Patent attorney

Akerman LLP

Chicago, IL · 60606

312-870-8019

Matthew P Pasulka

Reg. 42981

Patent agent

Peru, IL · 61354

763-531-3038

Prerna P Pasulka

Reg. 77229

Patent attorney

Susan Lampert & Associates

Deerfield, IL · 60015

773-719-5213

Sean M. Patchin· Jr.

Reg. 77772

Patent attorney

Greenberg Traurig

Chicago, IL · 60607

310-597-8287

Aseet Patel

Reg. 53874

Patent attorney

Banner & Witcoff, Ltd

Chicago, IL · 60606-7407

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.