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 Workiva, Inc., Lempia Summerfield Katz LLC, and John Bean Technologies Corporation.

Top cities in Illinois

All practitioners in Illinois

Dean Andrew Pelletier

Reg. 45007

Patent attorney

Chicago, IL · 60614

Lynn Q Peng

Reg. 69755

Patent attorney

Workiva, Inc.

Chicago, IL · 60603

312-631-7804

Amir N Penn

Reg. 40767

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60603

312-291-0860

Michael Charles Penn

Reg. 35640

Patent attorney

John Bean Technologies Corporation

Chicago, IL · 60602

312-861-6012

Alexander D. Penne

Reg. 83685

Patent agent

Chicago, IL · 60611

919-698-2355

Joan Pennington

Reg. 30885

Patent attorney

Joan Pennington Law Office

Batavia, IL · 60510

630-660-1200

Rachel Sue Pennington

Reg. 48391

Patent attorney

McDermott Will & Emery

Chicago, IL · 60606

312-984-7601

Venkatram Pepakayala

Reg. L1252

Limited recognition

Banner & Witcoff, Ltd.

Chicago, IL · 60606

312-463-5475

Ethan R Perbohner

Reg. 78356

Patent agent

Kirkland & Ellis LLP

Chicago, IL · 60654

815-347-3957

Enrique Perez

Reg. 43853

Patent attorney

Perez IP Law

Deerfield, IL · 60015

312-543-2104

Aaron Christopher Perez-Daple

Reg. 57766

Patent attorney

Perez & Sukovic, LLC

Lincolnshire, IL · 60069

312-285-6905

Jefferson Fizer Perkins

Reg. 31407

Patent attorney

Perkins IP Law Group LLC

Lisle, IL · 60532

630-505-1305

Samuel J Perkins

Reg. 74570

Patent attorney

Quinn Johnston

Peoria, IL · 61602

309-674-1133

Michael J Perry

Reg. 53451

Patent attorney

Perry Svcs

Zion, IL · 60099

847-872-8920

Sara Ellen Stephenson Peska

Reg. 62350

Patent attorney

Mahoney & Mahoney, LLC

Freeport, IL · 61032

815-656-4600

James T. Peterka

Reg. 59186

Patent attorney

Locke Lord LLP

Chicago, IL · 60606-4410

312-443-0270

Aaron Michael Peters

Reg. 48801

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Elizabeth A Peters

Reg. 68470

Patent attorney

Riverside, IL · 60546

708-853-9865

Grant Henry Peters

Reg. 35977

Patent attorney

Barnes & Thornburg, LLP

Chicago, IL · 60606

312-214-8332

Louis Michael Peters

Reg. 82268

Patent attorney

Peters Law, LLC

Aurora, IL · 60504

401-384-0753

Ann C Petersen

Reg. 55536

Patent attorney

Cardinal Law Group

Evanston, IL · 60201

408-223-2718

Maxwell James Petersen

Reg. 32772

Patent attorney

FisherBroyles LLP

Arlington Heights, IL · 60005

847-873-1116

Steven P Petersen

Reg. 32927

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Lucas A. Peterson

Reg. 81460

Patent attorney

Blank Rome LLP

Chicago, IL · 60606

312-776-2603

Shawn Leonard Peterson

Reg. 44286

Patent attorney

McAndrews Held and Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Timothy F Peterson

Reg. 58457

Patent attorney

Buchanan Ingersoll & Rooney PC

Chicago, IL · 60606

312-261-8777

John A Petravich

Reg. 53460

Patent attorney

Integrated DNA Technologies, Inc.

Skokie, IL · 60077

847-745-1700

George R Petrilli

Reg. 75024

Patent attorney

Springfield, IL · 62704

217-725-5614

Philip Todd Petti

Reg. 31651

Patent attorney

USG Corporation

Chicago, IL · 60565

312-436-4590

David Z Petty

Reg. 52119

Patent attorney

McAndrews Held and Malloy LTD

Chicago, IL · 60661

312-775-8000

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.