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 Silicon Valley Patent Group LLP, Walmart e Commerce, and Intuitive Surgical, Inc..

Top cities in California

All practitioners in California

Bryan H Wyman

Reg. 48049

Patent attorney

Silicon Valley Patent Group LLP

San Jose, CA · 95117

408-378-7777

Qing Xia

Reg. 71740

Patent attorney

San Diego, CA · 92121

858-320-3310

Qing Xia

Reg. 68375

Patent agent

Castro Valley, CA · 94552

919-357-8249

Shu F. Xia

Reg. 62136

Patent attorney

Walmart e Commerce

San Bruno, CA · 94066

650-794-7115

Alan Xiang

Reg. 71089

Patent attorney

Intuitive Surgical, Inc.

Sunnyvale, CA · 94086

408-523-7689

Jian Xiao

Reg. 55748

Patent attorney

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-5736

Jordan Y. Xiao

Reg. 84840

Patent agent

Arcadia, CA · 91007

626-590-9031

Yi Xiao

Reg. 76381

Patent agent

Los Angeles, CA · 90036

615-414-2124

Kaiyi Aureli Xie

Reg. 70381

Patent attorney

Roblox Corporation

San Mateo, CA · 94403

888-858-2569

Kenneth X Xie

Reg. 60350

Patent attorney

Manhattan Beach, CA · 90266

323-356-8882

Moses Xie

Reg. 74491

Patent agent

Redwood City, CA · 94061

408-702-7253

Xin Xie

Reg. 70890

Patent agent

Sheppard Mullin

Palo Alto, CA · 94301

703-597-4249

Daniel Xu

Reg. 69329

Patent attorney

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-242-4210

David C. Xu

Reg. 76701

Patent attorney

TikTok Inc.

Culver City, CA · 90230

281-638-2848

Jiancong Xu

Reg. 71952

Patent agent

Pasadena, CA · 91101

626-792-0536

Lei Xu

Reg. 67686

Patent attorney

Iovance Biotherapeutics, Inc.

San Carlos, CA · 94070

857-891-8102

Linjun Xu

Reg. 73887

Patent attorney

Russ August & Kabat LLP

Los Angeles, CA · 90025

310-826-7474

Meng Xu

Reg. 70119

Patent attorney

One LLP

Newport Beach, CA · 92660

949-502-2870

Ruping Xu

Reg. 53803

Patent agent

Univ Of California

Livermore, CA · 94551

925-422-9839

Shaun X. Xu

Reg. 66091

Patent attorney

Antioch, CA · 94531

415-652-5456

Yang Xu

Reg. 67268

Patent agent

Fremont, CA · 94536

650-417-5662

Yue Xu

Reg. 57967

Patent attorney

Apex Attorneys at Law, LLP

Alamo, CA · 94507

408-647-5296

David T. Xue

Reg. 54554

Patent attorney

KXT LAW, LLP

Redwood City, CA · 94061

650-379-6454

Jilin Xue

Reg. 77210

Patent agent

ZTE TX Inc.

Milipitas, CA · 95035

312-646-8391

Victor Weige Xue

Reg. 56603

Patent agent

Pacifica, CA · 94044

650-245-8061

Rajiv Yadav

Reg. 43999

Patent attorney

The Law Office of Rajiv Yadav

Santa Barbara, CA · 93067

626-720-4450

Sitaram Yadavalli

Reg. 82820

Patent agent

Onnivation, LLC

San Jose, CA · 95120

408-647-7026

Fariba Yadegar-Bandari

Reg. 53805

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-0397

Stacy P. Yae

Reg. 71848

Patent attorney

Los Angeles, CA · 90071

213-430-6588

Byron Y Yafuso

Reg. 45244

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121-1714

858-587-1121

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.