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 Lampel & Associates, P.C., Smith Landmeier & Elders P.C., and Porter Wright.

Top cities in Illinois

All practitioners in Illinois

Kami L Lammon-Hilinski

Reg. 51913

Patent attorney

Hawthorn Woods, IL · 60047

412--47-8-2069

Justin K Lampel

Reg. 51264

Patent attorney

Lampel & Associates, P.C.

Northbrook, IL · 60062

847-845-4345

Allen Lee Landmeier

Reg. 26476

Patent attorney

Smith Landmeier & Elders P.C.

Geneva, IL · 60134

630-232-2880

Eric L Lane

Reg. 66615

Patent attorney

Chicago, IL · 60601

919-418-8007

Joseph Peter Lang

Reg. 51918

Patent attorney

Arlington Heights, IL · 60005

847-577-8355

Julie L Langdon

Reg. 59001

Patent attorney

Porter Wright

Chicago, IL · 60654

312-275-8487

Mark A Langguth

Reg. 37375

Patent attorney

Argonne National Laboratory

Argonne, IL · 60439

630-252-5951

Tara E Langvardt

Reg. 69216

Patent attorney

Foley and Lardner LLP

Chicago, IL · 60654

312-832-4700

Joseph Ronald Lanser

Reg. 44860

Patent attorney

Taft Stettinius & Hollister

Chicago, IL · 60601-4208

312-836-4045

James Victor Lapacek

Reg. 26933

Patent attorney

Inverness, IL · 60010

847-907-4556

Carol A Larcher

Reg. 35243

Patent attorney

Sauk Village, IL · 60411-7300

312-550-4320

Bryce J Larson

Reg. 68054

Patent agent

Chicago, IL · 60613

314-910-8012

Connor M Larson

Reg. 81785

Patent attorney

McDermott Will & Schulte

Chicago, IL · 60606

872-260-0884

Elias T. Larson

Reg. 76387

Patent attorney

Polsinelli PC

Chicago, IL · 60606

312-873-3614

Silvan L Larson

Reg. 39264

Patent agent

Gilberts, IL · 60136

224-558-7968

Elizabeth D. Laudadio

Reg. 83737

Patent agent

Nixon Peabody LLP

Chicago, IL · 60602-4378

131-297-74469

Deborah A Laughton

Reg. 54253

Patent attorney

McAndrews Held and Malloy LTD

Chicago, IL · 60661

312-775-8000

Andrew M Lawrence

Reg. 46130

Patent attorney

Marshall, Gerstein & Borun LLP

Chicago, IL · 60606

312-474-6300

Sarah M. Lawton

Reg. 65615

Patent attorney

Dotomi, Inc.

Chicago, IL · 60661

312-477-5426

Kristen Ann-Baugher Lay

Reg. 50553

Patent attorney

Allstate Insurance Company

Northbrook, IL · 60062

847-402-2426

Quyen T Le

Reg. 53186

Patent agent

DSM Desotech INC

Elgin, IL · 60120

847-468-7775

Louis Henri Le Mieux

Reg. 19573

Patent attorney

LaGrange Park, IL · 60525

708-579-0234

Andrew P. Lea

Reg. 80460

Patent agent

Chicago, IL · 60615

715-644-8332

Garret A Leach

Reg. 41932

Patent attorney

Kirkland & Ellis LLP

Chicago, IL · 60654

312-862-2000

Craig D Leavell

Reg. 48505

Patent attorney

Barnes & Thornburg LLP

Chicago, IL · 60606

312-214-4868

Christopher J Lee

Reg. 41934

Patent attorney

Lee Sheikh Megley & Haan

Chicago, IL · 60604

312-982-0070

Dennis C Lee

Reg. 60922

Patent attorney

Discover Financial Services

Riverwoods, IL · 60015

224-405-1744

Garrett J. Lee

Reg. 82563

Patent attorney

McDonnell Boehnen Hulbert & Berghoff LLP

Chicago, IL · 60606

312-913-0001

George I Lee

Reg. 39269

Patent attorney

Lee Sullivan Shea & Smith, LLP

Chicago, IL · 60606

312-754-9606

Gilsoo Lee

Reg. 84028

Patent agent

Lisle, IL · 60532

540-750-6215

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.