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 S I U School of Medicine, Infosys Technologies LTD, and Patnaude & Videbeck.

Top cities in Illinois

All practitioners in Illinois

Neha J Pathak

Reg. 77482

Patent attorney

Skokie, IL · 60077

847-877-2123

Robert M Patino

Reg. 54367

Patent attorney

S I U School of Medicine

Springfield, IL · 62794-9616

217-545-8168

Dnyanesh S Patkar

Reg. 54368

Patent agent

Infosys Technologies LTD

Lisle, IL · 60532

214-529-2631

Edmond T Patnaude

Reg. 17683

Patent attorney

Patnaude & Videbeck

Oak Brook Terrace, IL · 60181

630-627-4552

Patrick L Patras

Reg. 37695

Patent attorney

Carpenter Lipps LLP

Chicago, IL · 60601

312-777-4823

Carmen B Patti

Reg. 26784

Patent attorney

Carmen Patti Law Group, LLC

Chicago, IL · 60602

312-346-2800

S Michael Patton

Reg. 36235

Patent attorney

Deere & Company

Moline, IL · 61265

309-765-5543

Timothy T Patula

Reg. 30791

Patent attorney

Patula and Associates, P.C.

Chicago, IL · 60603

312-201-8220

Douglas H Pauley

Reg. 33295

Patent attorney

Pauley Petersen & Erickson

Hoffman Estates, IL · 60169

847-490-1400

Thomas D Paulius

Reg. 30792

Patent attorney

TD Paulius, IP Law Attorney

Orland Park, IL · 60462

708-349-9283

Michael T. Paull

Reg. 84145

Patent agent

Quarles & Brady LLP

Chicago, IL · 60606

312-715-5260

George S Pavlik

Reg. 55528

Patent attorney

Levenfeld Pearlstein, LLC

Chicago, IL · 60606

312-346-8380

Michael C Payden

Reg. 24037

Patent agent

Rockford, IL · 61107

815-543-9094

Hiram R Peacock

Reg. 53445

Patent attorney

Chicago, IL · 60628

773-960-1126

Amy L Pearson

Reg. 57980

Patent attorney

Glenview, IL · 60026

847-510-5968

Louise Schaefer Pearson

Reg. 32369

Patent attorney

Axiom / Allscripts Healthcare

Highland Park, IL · 60035

847-710-1537

Paul C Pecoraro

Reg. 62011

Patent attorney

The Law Office of Paul C. Pecoraro, P.C.

Hawthorn Woods, IL · 60047

847-344-2237

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

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.