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 Nixon Peabody LLP, Qualcomm, and SiPix Imaging, Inc..

Top cities in California

All practitioners in California

Andrew Y Choung

Reg. 46622

Patent attorney

Nixon Peabody LLP

Los Angeles, CA · 90071

213-629-6166

Christopher S Chow

Reg. 46493

Patent attorney

Qualcomm

San Diego, CA · 92121-1714

858-845-3249

Elaine Y Chow

Reg. 46191

Patent attorney

San Francisco, CA · 94116

415-483-5795

Harold J Chow

Reg. 55068

Patent attorney

Los Altos, CA · 94022

650-903-9888

Judy L. Chow

Reg. 79885

Patent agent

Santa Ana, CA · 92704

562-818-1130

Y Ping Chow

Reg. 30740

Patent agent

SiPix Imaging, Inc.

Fremont, CA · 94538

510-743-2804

Bharat M Chowrira

Reg. 47491

Patent attorney

Nektar Therapeutics

San Carlos, CA · 94070

650-631-3100

Calvin Choy

Reg. 80526

Patent agent

Los Angeles, CA · 90071

424-305-8306

Cecilia L Choy

Reg. 75352

Patent attorney

McDermott Will & Schulte LLP

Menlo Park, CA · 94025

650-815-7684

Ming Wai Choy

Reg. 70428

Patent attorney

Texas Instruments Bldg E

Santa Clara, CA · 95051

669-721-4349

Jared E. Christensen

Reg. 73347

Patent attorney

Sierra IP Law, PC

Fresno, CA · 93711

559-436-3800

Kory D Christensen

Reg. 43548

Patent attorney

Polsinelli LLP

San Francisco, CA · 94111

415-248-2139

Michael R Christensen

Reg. 57505

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Tennille M Christensen

Reg. 52743

Patent agent

Mountain View, CA · 94043

415-806-7737

Jason T Christiansen

Reg. 56327

Patent attorney

Adamas Pharmaceuticals, Inc.

Emeryville, CA · 94608

510-450-3586

Sean O Christofferson

Reg. 63589

Patent attorney

Arista Networks

Santa Clara, CA · 95054

303-882-5069

John Stirling Christopher

Reg. 30937

Patent attorney

Santa Monica, CA · 90404-1325

310-828-5464

Anne E Christy

Reg. 78155

Patent agent

Mountain View, CA · 94041

650-335-7808

Alfred Y Chu

Reg. 62317

Patent attorney

San Diego, CA · 92121

000-000-0000

Allard C Chu

Reg. 69587

Patent attorney

Mulcahy LLP

Irvine, CA · 92614

949-252-9377

Bryan D Chu

Reg. 63312

Patent agent

Tiburon, CA · 94920

415-233-3993

George Ning Chu

Reg. 48132

Patent agent

Hacienda Heights, CA · 91745

626-968-8898

Joseph G. Chu

Reg. 64596

Patent attorney

JCIP

Los Angeles, CA · 90017

323-983-2293

Joshua T Chu

Reg. 59799

Patent attorney

Christie, Parker & Hale, LLP

Irvine, CA · 92612-0163

949-476-0757

Obert H Chu

Reg. 52744

Patent attorney

VAN PELT, YI & JAMES LLP

Cupertino, CA · 95014

408-207-4766

Peir Chu

Reg. 62821

Patent attorney

ON Semiconductor

Sunnyvale, CA · 94089

408-822-2021

Ping Chu

Reg. 50887

Patent attorney

Monterey Park, CA · 91755

626-307-3855

Roger H Chu

Reg. 52745

Patent agent

Saratoga, CA · 95070

408-521-0550

Tiffany Denise Chu

Reg. 901064

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

415-361-1602

Winston S Chu

Reg. 55071

Patent attorney

Roche Molecular Solutions

Santa Clara, CA · 95050

669-272-4792

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.