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 Marshall, Gerstein & Borun LLP, Leydig, Voit & Mayer LTD, and Banner & Witcoff, LTD.

Top cities in Illinois

All practitioners in Illinois

Gwen G Phanijphand

Reg. 74146

Patent agent

Chicago, IL · 60622

703-608-9058

Ryan N. Phelan

Reg. 60674

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606-6357

312-474-6300

Mark Edwin Phelps

Reg. 28461

Patent attorney

Leydig, Voit & Mayer LTD

Chicago, IL · 60654

312-616-5600

W Garland Phillips

Reg. 66521

Patent agent

Banner & Witcoff, LTD

Chicago, IL · 60606

312-463-5000

Justin Michael Philpott

Reg. 59945

Patent attorney

Banner Witcoff

Chicago, IL · 60606

312-463-5000

Ryan J. Pianetto

Reg. 68885

Patent attorney

McAndrews, Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

David J. Piasecki

Reg. 53467

Patent agent

UOP

Des Plaines, IL · 60017

847-391-3146

Cameron B. Pick

Reg. 71172

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Mackenzie S. Pike

Reg. 81636

Patent attorney

Chicago, IL · 60654

312-862-2000

Kyle M. Pikula

Reg. 82166

Patent agent

Palos Park, IL · 60464

708-642-3432

Sophia P. Pilipchuk

Reg. 79246

Patent agent

Hanley, Flight & Zimmerman, LLC

Chicago, IL · 60606

312-676-1737

Suresh B Pillai

Reg. 62726

Patent attorney

Suresh B. Pillai

Chicago, IL · 60616

773-230-5954

Xavier Pillai

Reg. 39799

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Ananya Pillutla

Reg. 78313

Patent agent

Marshall, Gerstein & Borun

Chicago, IL · 60606

312-474-6300

Eligio Cerda Pimentel

Reg. 42076

Patent attorney

McAndrews Held and Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Jeffrey A Pine

Reg. 36893

Patent attorney

Patzik, Frank & Samotny Ltd.

Chicago, IL · 60606

312-551-8300

Janet A Pioli

Reg. 35323

Patent attorney

Karnes Law Chartered

Chicago, IL · 60601

312-371-1299

Michael Piontek

Reg. 25605

Patent attorney

Chicago, IL · 60614

312-206-5435

Kevin J. Piotrowski

Reg. 78358

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-9567

Justin L Piper

Reg. 59227

Patent agent

Chicago, IL · 60615

773-752-3767

Rebecca P. Piper

Reg. 64457

Patent attorney

Kirkland & Ellis, LLP

Chicago, IL · 60654

312-862-7116

Robert Matthew Pipke

Reg. 41413

Patent attorney

Venture Gain LLC

Naperville, IL · 60563

800-516-7902

Phillip McKinney Pippenger· Jr

Reg. 46055

Patent attorney

McKinney Phillip LLC

Chicago, IL · 60607

847-738-1132

Sara M. Pistilli

Reg. 82287

Patent attorney

Katten Muchin Rosenman LLP

Chicago, IL · 60661-3693

312-902-5681

Kyle A. Planck

Reg. 83355

Patent agent

Blank Rome LLP

Chicago, IL · 60606

312-776-2588

Troy L. Plattner

Reg. 73055

Patent attorney

Superior Industries

Pekin, IL · 61554

309-453-3251

Gregory Thomas Pletta

Reg. 47864

Patent attorney

Nanosphere, Inc.

Northbrook, IL · 60062-1829

847-400-9020

Kelly A Plummer

Reg. 65452

Patent attorney

Morgan, Lewis & Bockius LLP

Chicago, IL · 60601

312-324-1490

Robert Gary Pluta

Reg. 50970

Patent attorney

Mayer Brown LLP

Chicago, IL · 60606

312-701-8641

Donald John Pochopien

Reg. 32167

Patent attorney

Long Grove, IL · 60047

847-566-5765

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.