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 Riot Games, Inc., Qualcomm, Inc, and Futurewei Technologies, Inc..

Top cities in California

All practitioners in California

Tom H Chang

Reg. 68801

Patent attorney

Fairfield, CA · 94534

707-864-0396

Tracy T Chang

Reg. 66952

Patent attorney

Fountain Valley, CA · 92708

415-722-1822

William M Chang

Reg. 61191

Patent attorney

Riot Games, Inc.

Los Angeles, CA · 90064

424-231-1111

Willy Chang

Reg. 62903

Patent attorney

Qualcomm, Inc

San Diego, CA · 92121

858-845-5064

Yeh K Chang

Reg. 41397

Patent attorney

Futurewei Technologies, Inc.

Santa Clara, CA · 95050

408-330-5335

Yi-Chung Chang

Reg. 55051

Patent agent

Sunnyvale, CA · 94087

Yijan E Chang

Reg. 54698

Patent attorney

Oruka Therapeutics

Menlo Park, CA · 94025

650-706-7509

Young A. Chang

Reg. 80093

Patent agent

Sheppard Mullin

San Francisco, CA · 94111

415-774-2932

Yu Hao P Chang

Reg. 70125

Patent agent

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

626-807-6326

Cherng H Chao

Reg. 62904

Patent attorney

Cerritos, CA · 90703

562-924-2343

Jade T Chao

Reg. 52720

Patent attorney

K Z Law

Palo Alto, CA · 94303

650-714-7060

Ting Mao Chao

Reg. 60126

Patent attorney

Edwards Vacuum, Inc.

Santa Clara, CA · 95054

408-496-1177 X 2222

Yuan Chao

Reg. 32118

Patent attorney

Fremont, CA · 94539

510-882-3538

William Lawrence Chapin

Reg. 27317

Patent attorney

Huntington Beach, CA · 92649

714-625-3580

Bruce G Chapman

Reg. 33846

Patent attorney

Karish & Bjorgum P.C.

Pasadena, CA · 91103

213-785-8070

John D Chapman

Reg. 70339

Patent attorney

Morrison and Foerster

Palo Alto, CA · 94306

650-813-5726

Stephen A Chapman

Reg. 78740

Patent agent

California Institute Technology

Pasadena, CA · 91125

626-395-6373

Reilly Marie Charles

Reg. 902901

Limited recognition

University of California, Los Angeles School of Law

Los Angeles, CA · 90095-1476

661-414-3302

Taylor D. Charon

Reg. 78288

Patent attorney

FMA, LLP

Los Angeles, CA · 90025

586-907-7168

Lin L. Chase

Reg. 69956

Patent agent

Sausalito, CA · 94965

650-438-1691

Hemant M. Chaskar

Reg. 60153

Patent agent

Exabeam, Inc.

Foster City, CA · 94404

844-392-2326

Dalton L. Chasser

Reg. 83843

Patent agent

Los Alamitos, CA · 90720

443-510-1665

Arthur J Chatroo

Reg. 41666

Patent attorney

Arthur J. Chatroo

Carlsbad, CA · 92008

858-775-0098

Nayantara M Chatterjee

Reg. 54680

Patent attorney

Netflix, Inc.

Los Gatos, CA · 95032

650-739-5592

Ranjini Chatterjee

Reg. 74434

Patent agent

Belmont, CA · 94002

650-594-4380

Urmi Chattopadhyay

Reg. 59018

Patent agent

Baker Botts L.L.P.

San Francisco, CA · 94111

415-291-6200

Yen Phi Chau

Reg. 51045

Patent attorney

Greenan, Peffer, Sallander & Lally LLP

San Ramon, CA · 94583

925-866-1000

Amitabha Chaudhuri

Reg. 70956

Patent agent

Redwood City, CA · 94062

650-780-9440

Matthew F. Chavez

Reg. 68318

Patent attorney

Aikin & Gallant, LLP

Los Altos, CA · 94022

650-741-0956

Jay P Chawla

Reg. 44073

Patent agent

Milpitas, CA · 95035

518-894-0562

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.