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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 Ryndak & Suri, LLP, GTI Energy, and Fulcrum GT.

Top cities in Illinois

Chicago1886Naperville52Peoria49Evanston37North Chicago27Northbrook27Arlington Heights27Deerfield26Moline25Glenview22Schaumburg19Lisle18Skokie18Buffalo Grove15Hinsdale15Lake Forest15Abbott Park15Lincolnshire15Hoffman Estates14Wheaton14

All practitioners in Illinois

Amy L. Ziolkowski

Reg. 63046
Patent attorney

Ryndak & Suri, LLP

Chicago, IL · 60606

312-419-7005

James I. Zirkle

Reg. 71849
Patent attorney

GTI Energy

Des Plaines, IL · 60521

847-544-3107

Rebecca JM Zobel

Reg. 51130
Patent agent

Fox River Grove, IL · 60021

847-639-9906

Elizabeth C. Zubiate

Reg. 75803
Patent agent

Fulcrum GT

Chicago, IL · 60601

915-861-6419

Donald L Zuhn

Reg. 48710
Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

Anthony S Zummer

Reg. 17865
Patent attorney

Palmatier & Zummer

Chicago, IL · 60603

312-456-0800

Peter Zura

Reg. 48196
Patent attorney

Loza & Loza, LLP

Chicago, IL · 91786

714-453-9824

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.
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