California

Patent attorneys in California

California hosts 9,567 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 Wilson Sonsini Goodrich & Rosati P.C., NetApp, Inc., and Lowenstein & Weatherwax LLP.

Top cities in California

All practitioners in California

Alice C Hsieh

Reg. 61334

Patent attorney

Wilson Sonsini Goodrich & Rosati P.C.

Palo Alto, CA · 94304

650-493-9300

Andrew L. Hsieh

Reg. 72234

Patent attorney

Sacramento, CA · 95826

916-905-6645

Arthur S Hsieh

Reg. 48247

Patent attorney

San Jose, CA · 95134

408-470-1000

Brandon Hsieh

Reg. 63197

Patent agent

NetApp, Inc.

San Jose, CA · 95128

408-822-3188

Edward Hsieh

Reg. 54188

Patent agent

Lowenstein & Weatherwax LLP

Los Angeles, CA · 90067

310-307-4547

Ho-Mu H Hsieh

Reg. 67890

Patent attorney

Google Inc.

Mountain View, CA · 94043

Jessica Y Hsieh

Reg. 80614

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130

858-314-7706

Peter Hsieh

Reg. 44780

Patent attorney

Fremont, CA · 94539

415-236-0993

Yu Chieh Ernest Hsin

Reg. 55283

Patent attorney

Gibson, Dunn & Crutcher LLP

San Francisco, CA · 94111

415-393-8224

Bor Kai Hsiung

Reg. 80546

Patent agent

San Diego, CA · 92122

330-703-7198

Andrea M Hsu

Reg. 67569

Patent agent

San Jose, CA · 95125

669-222-0679

Charles Hsu

Reg. 78024

Patent attorney

Dechert LLP

Palo Alto, CA · 94306

650-813-4808

Christy L. Hsu

Reg. 82080

Patent attorney

Newport Beach, CA · 92660

949-219-3615

Edward C. Hsu

Reg. 59739

Patent attorney

Kaufman Dolowich LLP

Los Angeles, CA · 90025

310-775-6511

Eric Y. Hsu

Reg. 67741

Patent attorney

Cupertino, CA · 95014

408-930-0514

Frederick Hsu

Reg. 65375

Patent attorney

Xilinx Inc.

San Jose, CA · 95124

510-673-5538

Jennifer L Hsu

Reg. 71473

Patent agent

Genentech, Inc.

South San Francisco, CA · 94080

626-283-2871

Johannes S Hsu

Reg. 74689

Patent attorney

Orrick, Herrington & Sutcliffe

Irvine, CA · 92614-8255

949-852-7776

Kendrick S Hsu

Reg. 72043

Patent attorney

Irvine, CA · 92606

818-903-6325

Lin Chia Lin Hsu

Reg. 46315

Patent attorney

Murabito Hao & Barnes LLP

San Jose, CA · 95113

408-938-9060

Margaret H Hsu

Reg. 69593

Patent agent

Redding, CA · 96003

650-995-6571

Michael K Hsu

Reg. 46782

Patent attorney

Intuit Inc.

Mountain View, CA · 94043

800-446-8848

Ming-Yuh Hsu

Reg. 67936

Patent attorney

Apple Inc.

Cupertino, CA · 95014

408-783-2678

Nigel J. Hsu

Reg. 68333

Patent agent

Google, Inc.

Mountain View, CA · 94043

650-253-1337

Richard C Hsu

Reg. 41853

Patent attorney

Shearman & Sterling LLP

Palo Alto, CA · 94306

650-838-3774

Susan Hsu

Reg. 75413

Patent agent

Albany, CA · 94706

714-422-5155

Teddie C Hsu

Reg. 67780

Patent attorney

Snell & Wilmer L.L.P.

Los Angeles, CA · 90071

213-929-2542

Vyson Hsu

Reg. 84064

Patent attorney

Thompson Hine LLP

San Mateo, CA · 94402

650-521-5930

Wenchi Hsu

Reg. 74994

Patent agent

Cupertino, CA · 95014

408-981-9691

Wendy Lei Hsu

Reg. 42794

Patent attorney

Pfizer, Inc

San Diego, CA · 92130

858-526-4652

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?

9,567 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.