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 SAP, Wilson Sonsini Goodrich & Rosati, and Nixon Peabody LLP.

Top cities in California

All practitioners in California

Bo Zeng

Reg. 68458

Patent agent

San Francisco, CA · 94111

858-692-8098

Jim S Zeng

Reg. 66674

Patent attorney

SAP

Palo Alto, CA · 94304

650-849-4000

Zheng Zeng

Reg. L1333

Limited recognition

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-858-7090

Yunlai Zha

Reg. 79508

Patent attorney

San Jose, CA · 95113

609-216-6660

Mark Sterling Zhai

Reg. 67270

Patent attorney

Nixon Peabody LLP

Los Angeles, CA · 90071-3151

213-629-6021

Adrianna P. P. Zhang

Reg. 72796

Patent agent

Ionis Pharmaceuticals, Inc.

Carlsbad, CA · 92010

760-306-3524

Angela L. Zhang

Reg. 62138

Patent agent

Fremont, CA · 94539

650-575-1679

Anna Zhang

Reg. 80209

Patent agent

San Francisco, CA · 94105

702-738-4788

Austin Weirong Zhang

Reg. 48061

Patent attorney

San Diego, CA · 92131-3549

858-368-9961

Brian C Zhang

Reg. 79865

Patent attorney

Thompson Hine LLP

Los Angeles, CA · 90067

310-382-1295

Christopher C. Zhang

Reg. 66093

Patent attorney

San Jose, CA · 95126-1757

408-890-7925

Clark A Zhang

Reg. 73804

Patent agent

Goodwin Proctor LLP

San Francisco, CA · 94111

415-733-6244

Daifei Zhang

Reg. 79356

Patent attorney

Ladas & Parry LLP

Los Angeles, CA · 90010

323-934-2300

Danlu Zhang

Reg. 79528

Patent attorney

Qualcomm Inc.

San Diego, CA · 92121

858-220-9383

Di Zhang

Reg. 74950

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130

858-720-5744

Diwei Zhang

Reg. 65350

Patent agent

Intuitive Surgical

Sunnyvale, CA · 94086

408-523-6476

Guang Y. Zhang

Reg. 70901

Patent attorney

Qualcomm

San Diego, CA · 92121

858-658-3493

Horace Y. Zhang

Reg. 76171

Patent agent

YHE Law LLP

Lafayette, CA · 94549

415-634-5705

Jason Y Zhang

Reg. 80142

Patent agent

Mountain View, CA · 94041

917-951-0588

Jiaxiao Zhang

Reg. 63235

Patent attorney

P&P Imports LLC

Irvine, CA · 92614

949-630-0447

Jie Zhang

Reg. 60242

Patent attorney

Hewlett-Packard Company

Palo Alto, CA · 94304

650-335-7297

Jimmy Z Zhang

Reg. 47201

Patent agent

Synergenics, LLC

San Francisco, CA · 94105

415-665-0844

Jin Zhang

Reg. 62549

Patent attorney

Marvell Semiconductor, Inc.

Santa Clara, CA · 95054

408-222-4990

Li Zhang

Reg. 70902

Patent attorney

Mintz, Levin, Cohn, Ferris, Glovsky, and Popeo, P.C.

San Diego, CA · 92130

858-314-1577

Lina Zhang

Reg. 58956

Patent attorney

Mountain View, CA · 94040

650-714-9301

Liping Zhang

Reg. 45520

Patent agent

Cisco System

San Jose, CA · 95134

408-527-5781

Manjing Zhang

Reg. 82002

Patent agent

Morrison Foerster

San Francisco, CA · 94105

415-832-9037

Nancy L Zhang

Reg. 69463

Patent attorney

Quinn Emanuel Urquhart & Sullivan

San Francisco, CA · 94111

415-875-6000

Nathan Y Zhang

Reg. 71401

Patent attorney

Applied Materials, Inc.

Santa Clara, CA · 95051

408-563-1152

Patrick J Zhang

Reg. 52394

Patent attorney

Townsend and Townsend and Crew LLP

San Francisco, CA · 94111-3834

415-273-8305

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.