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 Lempia Summerfield Katz LLC, Lee Sullivan Shea & Smith LLP, and Nixon Peabody LLP.

Top cities in Illinois

All practitioners in Illinois

Allison E. Strong

Reg. 79349

Patent attorney

Nixon Peabody LLP

Chicago, IL · 60602

872-271-6652

James R Stuber

Reg. 36022

Patent attorney

James R Stuber and Associates

Chicago, IL · 60656

773-693-2693

Alice C Su

Reg. 66125

Patent attorney

Akzo Nobel Services Inc.

Chicago, IL · 60607

312-544-7102

Katharine Nuehring Su

Reg. 64864

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Alexander A. Sudrzynski

Reg. 83656

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60604

312-854-8371

Barry W Sufrin

Reg. 27398

Patent attorney

Barry Sufrin

Glencoe, IL · 60011

847-544-1647

James V Suggs

Reg. 50419

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Chadwick A Sullivan

Reg. 60533

Patent attorney

Dover Corporation

Downers Grove, IL · 60515

630-743-2551

Irina N. Sullivan

Reg. 72922

Patent attorney

Nokia

Naperville, IL · 60563

810-955-2323

Keegan B Sullivan

Reg. 82113

Patent agent

Chicago, IL · 60614

913-707-0427

Sean M Sullivan

Reg. 40191

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

312-754-9607

Craig A Summerfield

Reg. 37947

Patent attorney

Lempia Summerfield Katz LLC

Chicago, IL · 60602

312-854-8371

Changxia Sun

Reg. 68527

Patent attorney

Eli Lilly Corporate Center

Indianapolis, IL · 46225

312-237-0234

Han Sun

Reg. 81001

Patent agent

Polsky Center for Entrepreneurship and Innovation

Chicago, IL · 60637

773-702-8136

Kalli Q. Sun

Reg. 66499

Patent agent

Naperville, IL · 60564

630-456-2266

Sunil Sundar

Reg. 69604

Patent attorney

Lee Sullivan Shea & Smith LLP

Chicago, IL · 60661

312-754-9602

Seetha L M Sundaram

Reg. 72412

Patent agent

Hoffman Estates, IL · 60192

847-924-3455

Mark K Suri

Reg. 36024

Patent attorney

Hinshaw & Culbertson

Chicago, IL · 60606

312-704-3000

Robert A Surrette

Reg. 52262

Patent attorney

McAndrews Held and Malloy LTD

Chicago, IL · 60661

312-775-8000

Jessica Lee Susie

Reg. 70736

Patent attorney

Deere & Company

Moline, IL · 61265

319-936-3280

Adam D. Sussman

Reg. 70506

Patent attorney

Chicago, IL · 60605

630-207-7440

Gregory F Sutthiwan

Reg. 55816

Patent agent

Chicago, IL · 60660

773-230-7415

Sarah M Svendsen

Reg. 69683

Patent agent

Glendale Heights, IL · 60139

219-617-5918

Garrick Svetov

Reg. 36694

Patent attorney

Highland Park, IL · 60035

847-748-8416

Kristina L Swanson

Reg. 67406

Patent attorney

Chicago, IL · 60604

773-208-7047

Mark D Swanson

Reg. 48498

Patent attorney

Pauley Erickson & Swanson

South Barrington, IL · 60010

847-490-1400

John R. Sweet

Reg. 59770

Patent agent

Chicago, IL · 60601

404-793-6866

Sean S Swidler

Reg. 49033

Patent attorney

Flener IP Law, LLC

Chicago, IL · 60202

312-724-8874

Anna Swietek

Reg. 56452

Patent attorney

Mount Prospect, IL · 60056

847-502-3967

Justin Swindells

Reg. 48733

Patent attorney

Ice Miller LLP

Chicago, IL · 60606

312-705-6021

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.