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 Bristol Myers Squibb, O'Melveny & Myers LLP, and Irell and Manella LLP.

Top cities in California

All practitioners in California

Yu Zheng

Reg. 63648

Patent attorney

Santa Clara, CA · 95051

408-478-5997

Haoshen Zhong

Reg. 63515

Patent agent

Palm Desert, CA · 92255

760-837-9089

Hong Zhong

Reg. 66530

Patent attorney

Irell and Manella LLP

Los Angeles, CA · 90067

310-203-7183

Jia Zhong

Reg. 71826

Patent agent

Wilson,Sonsini,Goodrich & Rosati

Los Angeles, CA · 90071

323-210-2917

Qiwen Zhong

Reg. 73237

Patent attorney

Bristol Myers Squibb

San Diego, CA · 92121

619-984-7466

Effie Y. Zhou

Reg. 80431

Patent agent

Morrison & Foerster

Palo Alto, CA · 94304

650-402-7515

Eric Y Zhou

Reg. 68842

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7116

Feng Zhou

Reg. 78935

Patent attorney

Bristol Myers Squibb

Brisbane, CA · 94005

530-649-1103

Jasper J Zhou

Reg. 84899

Patent agent

San Jose, CA · 95135

408-613-5487

Jianmin Zhou

Reg. 68421

Patent attorney

Law Offices Of James Zhou

City of Industry, CA · 91748

626-566-5511

Jie Zhou

Reg. 52395

Patent attorney

Morrison and Foerster LLP

Palo Alto, CA · 94304

650-813-5922

Ronghui Zhou

Reg. 72189

Patent agent

Fremont, CA · 94536

510-378-0958

Shao Bo Zhou

Reg. 78936

Patent agent

Dextrous Design Engineering LLC

El Sobrante, CA · 94803

628-215-1605

Wei Zhou

Reg. 44419

Patent attorney

Centrillion Technology, Inc.

Palo Alto, CA · 94303

650-618-0111

Xin Zhou

Reg. 68303

Patent attorney

Los Angeles, CA · 90034

310-710-3141

Xin-Yi Zhou

Reg. 63366

Patent attorney

O'Melveny & Myers LLP

Los Angeles, CA · 90071

213-430-7576

Ying Zhou

Reg. 800161

Limited recognition

Concord & Sage PC

Diamond Bar, CA · 91765

408-639-9188

YingYing Zhou

Reg. 67908

Patent agent

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1214

Yuefen Zhou

Reg. 73398

Patent agent

San Diego, CA · 92130

858-480-8220

Zeyi Zhou

Reg. 73001

Patent attorney

Sunshine Consumer Goods

San Francisco, CA · 94112

415-342-6012

Zhiming Zhou

Reg. 56479

Patent agent

Sunnyvale, CA · 94086

408-835-5940

Baiyu Zhu

Reg. 800106

Limited recognition

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304

608-504-0320

Bing-Yan Zhu

Reg. 55758

Patent agent

Palo Alto, CA · 94303-2905

650-329-8466

James J Zhu

Reg. 52396

Patent attorney

Jun He Law Office P.C.

Palo Alto, CA · 94303

650-265-2682

Janshon Zhu

Reg. 40260

Patent agent

HT Laboratories, Inc.

San Diego, CA · 92121

858-677-9432

Jia Zhu

Reg. 84662

Patent attorney

Fish & Richardson, P.C.

Redwood City, CA · 94063

650-839-5097

John X Zhu

Reg. 60579

Patent agent

O'Melveny & Myers LLP

San Francisco, CA · 94111

415-984-8978

Liyan Zhu

Reg. 71580

Patent agent

Polygon IP, LLP

Walnut Creek, CA · 94597

650-226-4351

Peng Zhu

Reg. 48063

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-658-2389

Song Zhu

Reg. 44420

Patent attorney

Zhu Lupkowski LLP

Berkeley, CA · 94704

415-971-3836

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.