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 Saporta Law Offices, Foley & Lardner LLP, and Michael Best & Friedrich LLP.

Top cities in Illinois

All practitioners in Illinois

Stephen T Saporta

Reg. 47054

Patent attorney

Saporta Law Offices

Joliet, IL · 60435

312-984-0418

Dusan Sarapa

Reg. 62012

Patent attorney

Foley & Lardner LLP

Chicago, IL · 60610

312-832-5156

Larry L Saret

Reg. 27674

Patent attorney

Michael Best & Friedrich LLP

Chicago, IL · 60606

312-661-2116

Anthony Joseph Sarli· Jr

Reg. 24517

Patent attorney

St. Charles, IL · 60175

630-443-8394

Joshua D Sarnoff

Reg. 36913

Patent attorney

DePaul University College of Law

Chicago, IL · 60604

312-362-6326

Steven John Sarussi

Reg. 32784

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Claire E. Saskowski

Reg. 77538

Patent attorney

Beem Patent Law Firm

Chicago, IL · 60604

312-201-0011

Matthew D Satchwell

Reg. 58870

Patent attorney

DLA Piper LLP (US)

Chicago, IL · 60601

312-368-2111

Joseph Ronald Sauer

Reg. 62775

Patent attorney

Carle Foundation Hospital

Urbana, IL · 61801

630-881-4073

Emily L. Savas

Reg. 61809

Patent agent

Locke Lord LLP

Chicago, IL · 60606

312-443-0700

Vaibhav Sawhney

Reg. 61166

Patent agent

Westmont, IL · 60559

630-460-8092

Janet E Sayre

Reg. 50345

Patent agent

Chicago, IL · 60618

773-777-7939

Lydia A. Scarpelli

Reg. 69704

Patent agent

Lydia Scarpelli

Glen Ellyn, IL · 60137

630-319-1469

Nate Frank Scarpelli

Reg. 22320

Patent attorney

Glen Ellyn, IL · 60137

630-469-8698

Paul Eugene Schaafsma

Reg. 32664

Patent attorney

NovusIP, LLC

Chicago, IL · 60654

312-664-0906

Courtney C Schaeffer

Reg. 56779

Patent attorney

K&L Gates LLP

Chicago, IL · 60602-4207

312-807-4373

John Andrew Schaerli

Reg. 26229

Patent attorney

Miner Entrprs INC

Geneva, IL · 60134

630-232-3016

Heather N Schafer

Reg. 64734

Patent attorney

Heather N. Schafer

Chicago, IL · 60660

224-829-2047

John M Schafer

Reg. 65509

Patent attorney

Akerman LLP

Chicago, IL · 60606

312-870-8011

Daniel J Schaffer

Reg. 68674

Patent attorney

Chicago, IL · 60606

312-377-4841

Christopher M Scharff

Reg. 53556

Patent attorney

McAndrews Held & Malloy Ltd

Chicago, IL · 60661

312-775-8000

James Allen Scheer

Reg. 29434

Patent attorney

Huschblackwell L.L.C.

Chicago, IL · 60606

312-655-1500

Kevin C. Scheer

Reg. 83232

Patent attorney

Elgin, IL · 60120

224-374-3138

Douglas John Scheflow

Reg. 31876

Patent attorney

Scheflow and Rydell

Elgin, IL · 60120

847-695-2800

Ryan J Schermerhorn

Reg. 65275

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Stephen T Scherrer

Reg. 45080

Patent attorney

Scherrer Patent & Trademark Law, P.C.

Crystal Lake, IL · 60014

815-307-2974

Phillip J Schieffer

Reg. 80903

Patent attorney

Northbrook, IL · 60062

715-579-3814

Jason Wayne Schigelone

Reg. 56243

Patent agent

Crowell & Moring

Chicago, IL · 60654

312-321-4200

Paul M Schimpf

Reg. 47060

Patent attorney

Stumpf & Gutknecht, P.C.

Columbia, IL · 62236

618-281-7626

Dennis Rolano Schlemmer

Reg. 24703

Patent attorney

Leydig Voit and Mayer LTD

Chicago, IL · 60601

312-616-5600

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.