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 Crowell & Moring LLP, Medline Industries Inc,, and Cooley LLP.

Top cities in Illinois

All practitioners in Illinois

David S Noskowicz

Reg. 55503

Patent attorney

Medline Industries Inc,

Mundelein, IL · 60060

847-643-4734

Mary K. Nowak

Reg. 83250

Patent attorney

Chicago, IL · 60606

312-463-5716

Nadeen Nsouli

Reg. 76859

Patent agent

Cooley LLP

Chicago, IL · 60606

312-881-6698

James R Nuttall

Reg. 44978

Patent attorney

Steptoe & Johnson LLP

Chicago, IL · 60606

312-577-1300

Michael K Nutter

Reg. 44979

Patent attorney

Winston & Strawn LLP

Chicago, IL · 60601-9703

312-558-7058

Paul J Nykaza

Reg. 38984

Patent attorney

Chicago, IL · 60643

773-383-2673

E. Brandon Nykiel

Reg. 62972

Patent agent

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4200

Scott D. Nyman

Reg. 66215

Patent attorney

Nyman IP LLC

Chicago, IL · 60606

312-487-2532

Robin Seunghyun O

Reg. 60043

Patent agent

Nokia

Naperville, IL · 60563

847-372-0658

Grace Law O'Brien

Reg. 48872

Patent attorney

Navteq North America, LLC

Chicago, IL · 60654

Susan A. O'Brien

Reg. 70700

Patent attorney

Jenner & Block LLP

Chicago, IL · 60654

773-372-0170

Terence P O'Brien

Reg. 43840

Patent attorney

Wilson Sporting Goods Co.

Chicago, IL · 60631

773--71-4-6498

Kevin A O'Connor

Reg. 64732

Patent attorney

Neal, Gerber & Elsenberg LLP

Chicago, IL · 60602

312-269-8000

Mercedes V. O'Connor

Reg. 72147

Patent attorney

Rockman, Videbeck & O'Connor

Oakbrook Terrace, IL · 60181

630-627-4552

Amanda L. O'Donnell

Reg. 58759

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

Chicago, IL · 60603-3406

312-577-7000

Mark E O'Flaherty

Reg. 53405

Patent attorney

State Farm Mutual Automobile Insurance CO

Bloomington, IL · 61710

309-735-8749

Frank R O'Hare

Reg. 63502

Patent agent

Chicago, IL · 60618

815-474-6232

Gavin J O'Keefe

Reg. 59916

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

James A O'Malley

Reg. 45952

Patent attorney

Molex, LLC

Lisle, IL · 60532

630-718-5534

Edward M O'Toole

Reg. 22477

Patent attorney

McCracken & Frank LLP

Chicago, IL · 60606

312-422-5613

Jimmie R Oaks

Reg. 24987

Patent attorney

Coal Valley, IL · 61240

309-234-5552

William P Oberhardt

Reg. 31861

Patent agent

Olson & Cepuritis

Chicago, IL · 60606

312-580-1180

Adnan Mohamad Obissi

Reg. 75081

Patent attorney

Chicago, IL · 60622

312-848-2773

Paul M Odell

Reg. 28332

Patent attorney

Wood Phillips Katz Clark & Mortimer

Chicago, IL · 60661

312-876-2116

James Matthew Oehler

Reg. 68591

Patent attorney

McDermott Will & Emery

Chicago, IL · 60606

312-899-7277

Douglas A Oguss

Reg. 48469

Patent attorney

Crowell & Moring LLP

Chicago, IL · 60611

312-321-4785

Hyun Oh

Reg. 74479

Patent agent

Chicago, IL · 60605

703-505-1291

Glenn W Ohlson

Reg. 28455

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60606

312-357-1313

Ifeyinwa O. Okafor

Reg. 82267

Patent attorney

Gurnee, IL · 60031

614-214-8737

Joseph P. Oldaker

Reg. 62041

Patent attorney

Oldaker Law, P.C.

Winnetka, IL · 60093

312-957-4230

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.