California

Patent attorneys in California

California hosts 9,553 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 Diffbot Corporation, Patent Law Office, and Dexcom.

Top cities in California

All practitioners in California

Michael K Tung

Reg. 60735

Patent agent

Diffbot Corporation

Sunnyvale, CA · 94085

510-759-3639

Laura N Tunnell

Reg. 45166

Patent agent

Patent Law Office

Santa Barbara, CA · 93101

805-563-6556

Ying Tuo

Reg. 38789

Patent attorney

Fremont, CA · 94539

408-387-4606

James N Tuozzo

Reg. 53706

Patent attorney

Dexcom

San Diego, CA · 92121

858-875-9730

Benilda S. Turner

Reg. 54480

Patent agent

Los Angeles, CA · 90064

310-470-8045

Charles D Turner

Reg. 76002

Patent attorney

Ionis Pharmaceuticals, Inc.

Carlsbad, CA · 92010

760-268-4981

Christopher M Turner

Reg. 45167

Patent agent

FibroGen, Inc.

San Francisco, CA · 94158

415-978-1745

Ellisen S Turner

Reg. 54503

Patent attorney

Kirkland & Ellis, LLP

Los Angeles, CA · 90067

310-552-4220

James M. Turner

Reg. 74602

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

858-876-8555

Robert H Turner

Reg. 48716

Patent attorney

San Diego, CA · 92122

858-453-6961

Roger C Turner

Reg. 27492

Patent attorney

Newport Beach, CA · 92663

949-548-5649

Thomas H Turpen

Reg. 46489

Patent agent

SensIT Ventures, Inc.

Davis, CA · 95616-4740

469-371-2608

Grace Tuyiringire

Reg. 79114

Patent attorney

Irell & Manella, LLP

Los Angeles, CA · 90067

574-361-8358

Timothy Thut Tyson

Reg. 28915

Patent attorney

Law Office of Lawrence S. Cohen

Los Angeles, CA · 90024-4963

310-231-6898

Marcos Christopher Tzannes

Reg. 77451

Patent agent

Petaluma, CA · 94954

925-980-8134

Linfong Z Tzeng

Reg. 65140

Patent attorney

San Francisco, CA · 94132

415-759-7829

Erich Chien-Shiung Tzou

Reg. 56927

Patent attorney

Vista IP Law Group, LLP

San Jose, CA · 95131

408-321-8663 EXT 205

Kou-Hu Tzou

Reg. 61552

Patent agent

Blairtech Solution LLC

Sunnyvale, CA · 94086

408-666-9433

Franklin D Ubell

Reg. 27009

Patent attorney

Greenberg Traurig LLP

Irvine, CA · 92612

949-732-6500

Albert R. Ubieta

Reg. 43212

Patent attorney

Torrey Pines Intellectual Property Group, P.C.

Del Mar, CA · 92014

858-354-0456

Misty M Uemura

Reg. 58876

Patent agent

San Jose, CA · 95110

650-208-5856

Daniel M Ueno

Reg. 64743

Patent agent

Lewis Roca Rothgerber Christie LLP

Glendale, CA · 91203

626-795-9900

Ronald Ugolick

Reg. 57080

Patent agent

San Dimas, CA · 91773

909-525-5525

Christian J Ullsperger

Reg. 48006

Patent attorney

Fenwick & West LLP

San Francisco, CA · 94104

415-875-2300

Morrison Ulman

Reg. 55691

Patent agent

Mojo Vision

Saratoga, CA · 95070

650-000-0000

William J Ulrich

Reg. 76504

Patent attorney

HG LAW LLP

San Jose, CA · 95113

669-213-1067

Alicia M. G. Umpierre

Reg. 72267

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2300

Olav M Underdal

Reg. 71154

Patent attorney

IDP Patent Services

Anaheim, CA · 92808

949-393-0024

Justin L Underwood

Reg. 61408

Patent attorney

Spectrum Pharmaceuticals, Inc.

Irvine, CA · 92656

949-743-9267

Stephen Eric Underwood

Reg. 77977

Patent attorney

Glaser Weil Fink Jacobs Howard Avchen & Shapiro LLP

Los Angeles, CA · 90067

949-287-6683

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?

9,553 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.