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 Fitch, Even, Tabin & Flannery, FlagshipIP, LLC, and Northwestern Pritzker School of Law.

Top cities in Illinois

All practitioners in Illinois

Jennifer R Andrew

Reg. 61185

Patent attorney

Fitch, Even, Tabin & Flannery

Chicago, IL · 60603

312-577-7000

Raymond A Andrew

Reg. 20695

Patent attorney

Chicago, IL · 60610

Dmitriy S Andreyev

Reg. 59628

Patent attorney

FlagshipIP, LLC

Skokie, IL · 60077

617-718-3600

Donald L Andruska

Reg. 55798

Patent agent

Glen Ellyn, IL · 60137

630-469-3906

Mary Lynn Andruska

Reg. 55801

Patent agent

Glen Ellyn, IL · 60137

630-469-3906

Evan Jordan Anixter

Reg. 902870

Limited recognition

Northwestern Pritzker School of Law

Chicago, IL · 60611

847-287-6215

Simon B Anolick

Reg. 37585

Patent attorney

HERE Technologies

Chicago, IL · 60606

224-766-0500

Paul T. Ansani

Reg. 80210

Patent attorney

Chicago, IL · 60618

224-616-9238

Amanda K Antons

Reg. 65236

Patent attorney

Dechert LLP

Lake Forest, IL · 60045

311-264-65800

Uchendu O. Anyaso

Reg. 51411

Patent attorney

Caterpillar Inc.

Peoria, IL · 61629

309-675-6034

Melissa A Anyetei

Reg. 62989

Patent attorney

Mayer Brown, LLP

Chicago, IL · 60606

312-701-7103

Brian T Apel

Reg. 71788

Patent attorney

Banner & Witcoff

Chicago, IL · 60606

312-463-5000

Mark A Appleton

Reg. 29607

Patent attorney

Appleton Law Office

Aledo, IL · 61231

309-582-5121

Cassidy J. Aranda

Reg. 82573

Patent agent

Chicago, IL · 60661

951-400-2177

David J Archer

Reg. 31076

Patent agent

David J Archer M.I. Inf. Sc.

Rockton, IL · 61072

815-871-2393

Nada J Ardeleanu

Reg. 54965

Patent attorney

Cardinal Health

Chicago, IL · 60606

312-270-2066

Vladimir I Arezina

Reg. 54966

Patent attorney

Lathrop Gage LLP

Chicago, IL · 60606

312-290-3325

Yoek Lin S T Armiger

Reg. 53953

Patent agent

Abbott Laboratories

Abbott Park, IL · 60064-6008

847-938-3694

Jeffrey P Armstrong

Reg. 54967

Patent attorney

Akerman LLP

Chicago, IL · 60606

312-634-5738

Lester N Arnold

Reg. 25241

Patent attorney

Schaumburg, IL · 60193

847-891-1620

Patrick J Arnold· Jr

Reg. 37769

Patent attorney

McAndrews Held & Malloy, Ltd.

Chicago, IL · 60661

312-775-8000

Riyazhassan M Asaria

Reg. 67305

Patent agent

Klintworth & Rozenblat IP LLP

Chicago, IL · 60607

630-286-7632

Mark E. Ashton

Reg. 65149

Patent agent

Elmhurst, IL · 60126

630-279-5658

Marlene K Astor

Reg. 46005

Patent agent

Shiloh, IL · 62221

571-274-1363

Yuri Astvatsaturov

Reg. 64832

Patent attorney

Panduit Corp.

Tinley Park, IL · 60487

708-532-1800 X 81302

Shuaib A Atique

Reg. 61307

Patent attorney

Hollister Incorporated

Libertyville, IL · 60048

847-918-3495

Madison B. Aufai

Reg. 80985

Patent agent

Sheppard Mullin Richter & Hampton LLP

Chicago, IL · 60654

312-499-0569

John M Augustyn

Reg. 33589

Patent attorney

Leydig, Voit and Mayer, LTD

Chicago, IL · 60601

312-616-5600

Stephen R Auten

Reg. 47396

Patent attorney

Taft Stettinius & Hollister LLP

Chicago, IL · 60601

312-840-4313

Amir Azaran

Reg. 70243

Patent attorney

Loeb & Loeb LLP

Chicago, IL · 60654

312-464-3330

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.