California

Patent attorneys in California

California hosts 9,567 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 California. 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 Gilead Sciences, Kim & Stewart LLP, and Imperium Patent Works, LLP.

Top cities in California

All practitioners in California

Lisa E Marks

Reg. 44901

Patent attorney

San Mateo, CA · 94401

Matthew C Marlowe

Reg. 55428

Patent attorney

South Pasadena, CA · 91030

510-529-6832

Timothy A Marquart

Reg. 63700

Patent attorney

Gilead Sciences

Foster City, CA · 94404

650-358-8046

Donald F. Marra

Reg. 79698

Patent attorney

Kim & Stewart LLP

San Jose, CA · 95113-1811

408-899-6442

Mark D. Marrello

Reg. 69378

Patent attorney

Imperium Patent Works, LLP

Pleasanton, CA · 94566

925-862-9972

Mark D Marsden

Reg. 57871

Patent attorney

San Diego, CA · 92103

619-708-0896

Eric F. Marsh

Reg. 72654

Patent attorney

Global Tel*Link

San Francisco, CA · 94111

415-300-4395

Philip William Marsh

Reg. 46061

Patent attorney

Arnold & Porter LLP

Palo Alto, CA · 94306

650-319-4733

Theodore A Marsh

Reg. 53272

Patent agent

Albany, CA · 94706

650-224-0223

Anthony J Marshall

Reg. 56406

Patent agent

Sheppard, Mullin, Richter & Hampton LLP

Palo Alto, CA · 94301

650-815-2692

Jeffrey B Marshall

Reg. 69724

Patent attorney

Los Angeles, CA · 90049

805-570-0018

K Lee Marshall

Reg. 51999

Patent attorney

Bryan Cave Leighton Paisner LLP

San Francisco, CA · 94111

415-675-3400

Ashley M. Martin

Reg. 80248

Patent agent

San Diego, CA · 92120

858-382-4877

Brandon C. Martin

Reg. 79423

Patent attorney

San Francisco, CA · 94116

520-403-0169

Bredt D Martin

Reg. 42842

Patent attorney

Bredt D. Martin Esq.

Canyon Country, CA · 91387

818-642-2802

Brian David Martin

Reg. 47771

Patent attorney

Long Beach, CA · 90803

Clinton J Martin

Reg. 56407

Patent attorney

Verily Life Sciences LLC

South San Francisco, CA · 94080

Grace Naomi Martin

Reg. 82403

Patent agent

YHE Law LLP

Lafayette, CA · 94549

415-634-5481

James P Martin

Reg. 47772

Patent attorney

Shartsis Friese LLP

San Francisco, CA · 94111

415-421-6500

Jill Dyan Martin

Reg. 50006

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-922-1414

John Scott Martin

Reg. 72850

Patent attorney

View, Inc.

Alviso, CA · 95002-1180

408-263-9200

Julia A. Martin

Reg. 45817

Patent attorney

Martin Tech Law

Menlo Park, CA · 94025

650-473-0681

Margaret L. Martin

Reg. 84068

Patent agent

Orange, CA · 92869

714-907-7654

Michael F Martin

Reg. 52001

Patent attorney

Workday, Inc.

Pleasanton, CA · 94588

650-352-3416

Nathan Edward Martin

Reg. 902912

Limited recognition

University of California, Los Angeles School of Law

Los Angeles, CA · 90095-1476

913-240-5679

Neil F Martin

Reg. 23088

Patent attorney

Neil F. Martin and Associates

Menifee, CA · 92584

858-756-6859

Paul R Martin

Reg. 24593

Patent attorney

Martin Law Offices

Fairfield, CA · 94534

707-208-7637

Robert B Martin

Reg. 26945

Patent attorney

San Jose, CA · 95129

408-446-9455

Robert T Martin

Reg. 32426

Patent agent

Gard & Kaslow LLP

Los Altos, CA · 94022

650-305-3050

Roger W Martin

Reg. 39291

Patent agent

NorthCityWest Group, LLC

Del Mar, CA · 92014

858-204-0453

Common questions

Do I need a patent attorney based in California?

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 California-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 California?

9,567 active USPTO-registered patent practitioners list a California 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.