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 Therakem, LLC, Quinn Emanuel, and Weaver Austin Villeneuve & Sampson LLP.

Top cities in California

All practitioners in California

Bruno Tse

Reg. 59459

Patent agent

Therakem, LLC

San Diego, CA · 92104

619-808-3773

Gregory S. W. Tse

Reg. 63119

Patent attorney

San Francisco, CA · 94122

610-930-1800

Jonathan S M Tse

Reg. 70738

Patent agent

Quinn Emanuel

San Francisco, CA · 94111

415-875-6600

Lydia S Tse

Reg. 63884

Patent agent

Seal Beach, CA · 90740

562-431-1591

Michael Y. Tse

Reg. 69392

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612-0250

510-663-1100

George G C Tseng

Reg. 41355

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

714-453-9824

Kaiwen Tseng

Reg. 40848

Patent attorney

Orrick Herrington and Sutcliffe, LLP

Menlo Park, CA · 94025

650-614-7688

Min-Zing Tseng

Reg. 75907

Patent agent

Irvine, CA · 92620

949-396-2660

Harold T Tsiang

Reg. 35721

Patent attorney

KWM

San Francisco, CA · 94116

408-848-1885

Kyriacos S. Tsircou

Reg. 53705

Patent attorney

Tsircou Intellectual Property Law

Los Angeles, CA · 90027

323-660-9916

Roland Tso

Reg. 39403

Patent attorney

Lafayette, CA · 94549

925-284-3260

Harry H. Tsoi

Reg. 61175

Patent agent

Torrance, CA · 90504

310-906-0828

Kam-Cheong A Tsoi

Reg. 78378

Patent agent

Carlsbad, CA · 92010

858-205-0750

Si-Ming Tsui

Reg. 74820

Patent attorney

Aka Chan LLP

Santa Clara, CA · 95050

408-800-1912

Makoto Tsunozaki

Reg. 71691

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

415-954-4114

Evert Farah Uy Tu

Reg. 57004

Patent attorney

Haynes and Boone, LLP

Costa Mesa, CA · 92626

949-202-3000

Kuan Chieh Tu

Reg. 70414

Patent attorney

McGuireWoods LLP

San Francisco, CA · 94111

415-490-0918

Xiaomin Tu

Reg. 73318

Patent agent

Chevron Oronita Company

Richmond, CA · 94802

510-242-1607

Aaron M Tuch

Reg. 63849

Patent agent

San Francisco, CA · 94114

619-944-4886

Ido Tuchman

Reg. 45924

Patent attorney

Law Office of Ido Tuchman

Cardiff, CA · 92007

760-916-1994

David M Tuck

Reg. 43208

Patent agent

Chevron Corporation

Richmond, CA · 94802

510-242-5583

Mary A Tuck

Reg. 47144

Patent attorney

Activision Publishing, Inc.

Santa Monica, CA · 90405

310-255-2746

Guy V Tucker

Reg. 45302

Patent agent

Guy Tucker Patents

Somerset, CA · 95684

415-279-7703

Michael G. Tucker

Reg. 66222

Patent agent

D2S, Inc

San Jose, CA · 95117

650-380-1728

Susan Y. Tull

Reg. 61551

Patent attorney

Russ August & Kabat

Los Angeles, CA · 90025

131-082-67474

Terry K Tullis

Reg. 59856

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Sarah E. Tully

Reg. 73062

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

650-452-8910

Richard Y Tun

Reg. 56594

Patent attorney

Culver City, CA · 90230

310-815-1031

Hao-Yuan Tung

Reg. 43209

Patent attorney

San Jose, CA · 95161

Jeffrey J. Tung

Reg. 59407

Patent attorney

Bristol Myers Squibb

San Diego, CA · 92121

858-558-7500

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.