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, Greenberg Traurig, LLP, and ASSIA.

Top cities in Illinois

All practitioners in Illinois

Howard Earl Silverman

Reg. 32492

Patent attorney

Greenberg Traurig, LLP

Chicago, IL · 60601

312-456-5202

Peter J Silverman

Reg. 77563

Patent agent

ASSIA

Evanston, IL · 60202-3220

847-226-5069

Donald J Silvert

Reg. 37552

Patent attorney

Silvert IP Law, PC

Northbrook, IL · 60065

847-834-9764

Emer L Simic

Reg. 61235

Patent attorney

Green, Griffith & Borg-Breen, LLP

Chicago, IL · 60611

312-883-8017

Viktor Simkovic

Reg. 56012

Patent agent

Fitch, Even, Tabin & Flannery LLP

Chicago, IL · 60603

312-577-7000

Federico Simone

Reg. 59457

Patent attorney

Chicago, IL · 60626

312-363-8852

Raymond B. Simons

Reg. 68363

Patent attorney

River Forest, IL · 60305

708-912-3894

Dawn M Sims

Reg. 47090

Patent attorney

Chicago, IL · 60601

602-377-6148

Bryan F Singer

Reg. 68281

Patent agent

Champaign, IL · 61822

630-334-2367

Christopher P. Singer

Reg. 48701

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-2118

Alan R Singleton

Reg. 54452

Patent attorney

Singleton Law Firm, P.C.

Champaign, IL · 61820

217-352-3900

Connor P Singleton

Reg. 75324

Patent attorney

Bishop Diehl & Lee, LTD

Schaumburg, IL · 60173

847-969-9213

Erika R. Singleton

Reg. 52368

Patent attorney

Cabot Microelectronics Legal Department

Aurora, IL · 60504

630-499-2686

Ravi K Sinha

Reg. 69026

Patent attorney

Deere & Company

Moline, IL · 61265

309-748-8668

Sharon M Sintich

Reg. 48484

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Luke J. Sisto

Reg. 83191

Patent agent

Marshall, Gerstein and Borun LLP

Chicago, IL · 60606

312-423-3448

Gregory P Sitrick

Reg. 57195

Patent attorney

Quarles & Brady LLP

Chicago, IL · 60654-3422

312-715-5048

Muthuswamy Sivakumar

Reg. 53363

Patent agent

IPtelligence

Tower Lakes, IL · 60010

224-517-8633

Jacob D. Skebba

Reg. 81309

Patent attorney

Arch & Lake LLP

Chicago, IL · 60601

312-558-1369

Michelle Ware Skinner

Reg. 54738

Patent attorney

Edwards Maxson Mago & Macaulay, LLP

Chicagi, IL · 60654

312-933-3165

Steven H Sklar

Reg. 42154

Patent attorney

Leydig Voit and Mayer, Ltd.

Chicago, IL · 60601

312-616-5600

Soula Skokos

Reg. 55624

Patent attorney

Skokos Law Group, LLC

Oak Brook, IL · 60523

630-368-1699

Gregory J Skony

Reg. 60939

Patent attorney

Chicago Mercantile Exchange, Inc.

Chicago, IL · 60606

312-466-7470

Sara M Skulman

Reg. 75045

Patent attorney

Lathrop & Gage LLP

Chicago, IL · 60606

312-920-3318

Joanna Skyles

Reg. 54454

Patent agent

Perkins Coie LLP

Chicago, IL · 60603

312-324-8400

Robert W Slater

Reg. 30426

Patent attorney

R. Winston Slater

Hampshire, IL · 60140

847-658-1400

Ryan R. Slechta

Reg. 82524

Patent agent

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Carolyn M Sloane

Reg. 44339

Patent agent

Naperville, IL · 60565-6188

630-364-2697

Robert Earl Sloat

Reg. 26807

Patent attorney

Vernon Hills, IL · 60061

847-767-4507

Brian J Slosson

Reg. 53605

Patent agent

Thomas More Society

Chicago, IL · 60303

312-782-1680

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.