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 Wilson Sonsini, Google, Inc., and O'Melveny and Myers LLP.

Top cities in California

All practitioners in California

Pouya Yaghmaie

Reg. 73802

Patent attorney

Wilson Sonsini

San Diego, CA · 92130-3002

858-350-2212

Rosa Suazo Yaghmour

Reg. 56753

Patent attorney

Google, Inc.

Mountain View, CA · 94043

650-772-2674

Ryan K Yagura

Reg. 47191

Patent attorney

O'Melveny and Myers LLP

Los Angeles, CA · 90071

213-430-6189

John C Yakes

Reg. 27245

Patent attorney

Palo Alto, CA · 94301

650-323-2300

Halit N. Yakupoglu

Reg. 61179

Patent agent

Corona, CA · 92879

951-738-1152

Fumiko Yamaguchi

Reg. 58920

Patent agent

Palo Alto, CA · 94306

650-328-2975

Brent K Yamashita

Reg. 53808

Patent attorney

DLA Piper LLP (US)

East Palo Alto, CA · 94303-2215

650-833-2348

Lori L Yamato

Reg. 40881

Patent attorney

Knobbe Marten Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Angela M Yamauchi

Reg. 68300

Patent agent

CIONCA IP LAW P.C.

Irvine, CA · 92614

949-334-3036

Wade Christian Yamazaki

Reg. 72433

Patent attorney

Intuitive Surgical, Inc.

Sunnyvale, CA · 94086

702-336-9233

Lin Yan

Reg. 77956

Patent agent

Kilpatrick Townsend & Stockton LLP

San Francisco, CA · 94111

415-273-4303

Ming Yan

Reg. 83819

Patent agent

Treeline Biosciences

San Diego, CA · 92121

858-952-8119

Shuqian Yan

Reg. 66750

Patent attorney

Milpitas, CA · 95035

925-285-2720

James Hunt Yancey· Jr

Reg. 53809

Patent attorney

QUALCOMM,INC.

San Diego, CA · 92121-1714

858-845-7534

Molly Elizabeth Yancher

Reg. 83766

Patent agent

San Diego, CA · 92119

619-962-6230

Vernon R Yancy

Reg. 52379

Patent attorney

Los Angeles, CA · 90043

323-864-1808

Margaret A. Yandell-Zhao

Reg. 75777

Patent agent

BridgeBio Pharma, Inc.

Palo Alto, CA · 94304

858-531-7323

Andy Yang

Reg. 80688

Patent attorney

Sunnyvale, CA · 94086

408-475-6140

Cato Yang

Reg. 57310

Patent attorney

Xperi Corp.

San Jose, CA · 95134

630-779-9317

Changwoo Yang

Reg. 73037

Patent agent

Qualcomm Incorporated

San Diego, CA · 92121

858-845-5442

Charles C. Yang

Reg. 62059

Patent attorney

LeClairRyan

Sacramento, CA · 95814

916-246-1147

David Chu-An Yang

Reg. 75704

Patent attorney

Hawkinson Yang LLP

Los Angeles, CA · 90046

213-634-0341

David T Yang

Reg. 44415

Patent attorney

Morrison & Foerster, LLP

Los Angeles, CA · 90017

213-892-5587

Elizabeth Yang

Reg. 61458

Patent agent

LAW & MEDIATION OFFICES OF ELIZABETH YANG

MONTEREY PARK, CA · 91754

909-996-5906

Fei-hung Yang

Reg. 77188

Patent agent

Diamond Bar, CA · 91765

909-680-0177

Frank B Yang

Reg. 65788

Patent attorney

Applied Materials

Santa Clara, CA · 95051

408-563-6725

Hain-Ann H Yang

Reg. 65993

Patent agent

RefleXion Medical

Hayward, CA · 94545

650-542-0311

Hanbiao Yang

Reg. 68097

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-354-2847

Hsueh-Li Yang

Reg. 77978

Patent agent

Walnut, CA · 91788

909-530-9220

I-Chang John Yang

Reg. 60384

Patent attorney

TDK U.S.A. Corporation

San Jose, CA · 95110

650-623-7446

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.