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 Department of Chemistry and Biochemistry, Wilson Sonsini Goodrich and Rosati, PC, and Knobbe, Martens, Olson & Bear.

Top cities in California

All practitioners in California

Wesley WL Chen

Reg. 78344

Patent agent

San Diego, CA · 92130

858-720-5100

Xiaohong Chen

Reg. 78259

Patent agent

Department of Chemistry and Biochemistry

Los Angeles, CA · 90095

312-479-3832

Xiaoying Shirley Chen

Reg. 44608

Patent attorney

Wilson Sonsini Goodrich and Rosati, PC

Palo Alto, CA · 94304

650-565-3856

Xiaoyu Chen

Reg. 800084

Limited recognition

Knobbe, Martens, Olson & Bear

Irvine, CA · 92614

949-390-1039

Ya-Fen Chen

Reg. 51553

Patent attorney

JAS Law, LLP

Sunnyvale, CA · 94085

408-900-8900

Yean Nian W Chen

Reg. 68534

Patent agent

SONOS, Inc.

Santa Barbara, CA · 93101

312-935-2351

Yi Chen

Reg. 71437

Patent attorney

Tensegrity Law Group LLP

Redwood Shore, CA · 94065

650-802-6011

Yi-Ju Chen

Reg. 79474

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4000

Yige Chen

Reg. 50414

Patent agent

ThreePalm Techlegal Law Office

San Jose, CA · 95123

408-227-1951

Yigong Justin Chen

Reg. 52730

Patent attorney

Foster City, CA · 94404

650-580-9793

Ying Chen

Reg. 50193

Patent attorney

Chen Yoshimura LLP

Los Angeles, CA · 90012

213-625-5076

Ying-Ting Chen

Reg. 76975

Patent agent

Temple City, CA · 91780

626-818-3145

Yun Chia S Chen

Reg. 62560

Patent attorney

Dewey & LeBoeuf LLP

East Palo Alto, CA · 94303

650-845-7061

Yuwei Chen

Reg. 76705

Patent agent

San Diego, CA · 92126

608-469-0879

Zhengzheng Chen

Reg. 76024

Patent agent

Arcadia, CA · 91007

818-826-0632

Susanna L Chenette

Reg. 64281

Patent attorney

Manatt, Phelps & Phillips

Palo Alto, CA · 94304

650-812-1385

Kenneth C Cheney

Reg. 61841

Patent attorney

Morgan, Lewis & Bockius

Costa Mesa, CA · 92626

714-830-0526

Andrew Chiwu Cheng

Reg. 60891

Patent agent

San Diego, CA · 92198

909-436-5796

Ann Huan-Yu Cheng

Reg. 69854

Patent agent

Menlo Park, CA · 94025

650-543-1537

Charles T. Cheng

Reg. 59500

Patent attorney

Oracle Corporation

Redwood City, CA · 94065

408-276-9924

Clement Cheng

Reg. 45463

Patent attorney

Newhope Law, PC

Los Alamitos, CA · 90720

714-825-0555

Darya C. Cheng

Reg. 81593

Patent agent

BOZICEVIC, FIELD & FRANCIS LLP

Redwood City, CA · 94065

650-327-3400

Edith H. Cheng

Reg. 82074

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-617-7600

Hanchel Cheng

Reg. 79223

Patent attorney

Fenwick and West LLP

Mountain View, CA · 94041

650-335-4927

Henry C. Cheng

Reg. 67442

Patent attorney

White & Case LLP

Palo Alto, CA · 94306

650-213-0327

Hsiang Cheng

Reg. 80114

Patent agent

Sunnyvale, CA · 94089

408-655-7688

Jason S Cheng

Reg. 59103

Patent attorney

Orrick, Herrington & Sutcliffe LLP

Menlo Park, CA · 94025-1015

650-614-7400

Jennifer C. Cheng

Reg. 59797

Patent attorney

Avalanche Biotechnologies, Inc.

Menlo Park, CA · 94025

714-246-4015

Jonathan D Cheng

Reg. 67912

Patent attorney

Procopio, Cory, Hargreaves & Savitch

Irvine, CA · 92618

310-729-2126

Julie J L Cheng

Reg. 33848

Patent attorney

New Bamboo Consulting

Berkeley, CA · 94707

415-608-4812

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.