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 McDermott Will & Schulte LLP, Texas Instruments Bldg E, and Sierra IP Law, PC.

Top cities in California

All practitioners in California

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

Christine B Chua

Reg. 51562

Patent attorney

Dechert LLP

Mountain View, CA · 94040

650-813-4800

Chze Koon Chua

Reg. 53831

Patent agent

Blakely Sokoloff Taylor & Zafman

San Jose, CA · 95113

408-947-8200 EXT 213

Abraham W Chuang

Reg. 67886

Patent attorney

Irvine, CA · 92602

949-751-2336

Chester S Chuang

Reg. 55072

Patent attorney

Associate Professor

San Francisco, CA · 94105

415-442-6600

Chien-Ju Alice Chuang

Reg. 65914

Patent attorney

Marton Ribera Schumann & Chang LLP

San Francisco, CA · 94104

415-360-2516

Christopher D. Chuang

Reg. 75524

Patent agent

Sunnyvale, CA · 94087

510-918-4345

Michael T Chuang

Reg. 57431

Patent agent

Arcadia, CA · 91007

626-446-5388

Thomas C Chuang

Reg. 44616

Patent attorney

Chuang IP Law

Menlo Park, CA · 94026

141-527-42598

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.