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 Fernando & Partners LLP, Paradice and Li, LLP, and UC Berkeley.

Top cities in California

All practitioners in California

Ying Li

Reg. 65924

Patent attorney

Fernando & Partners LLP

Santa Clara, CA · 95054

650-521-5390

Yipeng Li

Reg. 60595

Patent attorney

Paradice and Li, LLP

Campbell, CA · 95011

408-389-0268

Yongdan Li

Reg. 62242

Patent attorney

UC Berkeley

Berkeley, CA · 94720-2320

510-664-2974

Yue Li

Reg. 69573

Patent attorney

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-5600

Zhaolong Li

Reg. 70683

Patent attorney

Davis, CA · 95616

301-963-1992

Zhaoyang Li

Reg. 46872

Patent agent

Fennemore

Oakland, CA · 94607

510-834-6600

Zhehui Li

Reg. 84614

Patent agent

Los Angeles, CA · 90018

330-289-7166

Zhi Li

Reg. 66694

Patent agent

at&t Services, Inc.

San Ramon, CA · 94583

925-904-0164

Zhifei Li

Reg. 81044

Patent attorney

Monterey, CA · 93940

424-333-4575

Ziyong Li

Reg. 76089

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

San Francisco, CA · 94111

415-875-6373

Gabriella S. Liace

Reg. 81612

Patent agent

Kleinberg & Lerner LLP

Century City, CA · 90067

310-557-1511

Alyssa Y. Liang

Reg. 59179

Patent agent

Palo Alto, CA · 94301

650-996-7068

Amy K Liang

Reg. 74194

Patent attorney

O'Melveny & Myers

San Francisco, CA · 94111

415-984-8905

Bing Liang

Reg. 76745

Patent attorney

Jones Day

Palo Alto, CA · 94303

650-687-4168

Chang Hsing Liang

Reg. 59831

Patent agent

Wilson Sonsini Goodrich and Rosati PC

San Diego, CA · 92130

858-350-2335

Hanshuang Liang

Reg. 77472

Patent agent

Leydig, Voit & Mayer, LLP

Walnut Creek, CA · 94596

925-482-0104

Jeffrey Liang

Reg. 69043

Patent attorney

Menlo Park, CA · 94025

650-815-2685

Kerry S Liang

Reg. 60519

Patent attorney

Liang & Cheng, PC

San Jose, CA · 95157

650-468-1401

Leslie Y Liang

Reg. 63497

Patent attorney

San Diego, CA · 92130

858-523-3949

Mark Liang

Reg. 81045

Patent attorney

O'Melveny & Myers LLP

San Francisco, CA · 94111

773-398-2871

Teresa Y Liang

Reg. 51946

Patent agent

Isis Pharmaceuticals, Inc.

Carlsbad, CA · 92010

760-603-4601

Tianyang Liang

Reg. 81241

Patent agent

Los Angeles, CA · 90071

213-297-1293

Wei Liang

Reg. 75725

Patent agent

Monrovia, CA · 91016

626-679-3111

Wing H Liang

Reg. 78846

Patent attorney

RPX Corporation

San Francisco, CA · 94111

415-852-3087

Yuhao Liang

Reg. 77346

Patent attorney

San Jose, CA · 95126

650-417-8676

Cindy Wangchun Liao

Reg. 59316

Patent agent

Lawrence Berkeley National Laboratory

Berkeley, CA · 94720

510-486-7025

Cynthia S Liao

Reg. 81083

Patent attorney

Applied Materials

Santa Clara, CA · 95054

408-386-2078

Jen-Yiu Kevin Liao

Reg. 56219

Patent attorney

San Leandro, CA · 94578

415-312-3261

Liang Liao

Reg. 66517

Patent agent

Pleasanton, CA · 94566

925-461-3178

S Alex Liao

Reg. 39463

Patent attorney

Law Offices of S. Alex Liao

San Jose, CA · 95110

408-501-0999

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.