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 Jones Day, Wilson Sonsini Goodrich and Rosati PC, and Leydig, Voit & Mayer, LLP.

Top cities in California

All practitioners in California

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

Yiping R Liao

Reg. 60301

Patent attorney

Hickman, Palermo, Truong & Becker, LLP

San Jose, CA · 95110

408-414-1080

Winston Liaw

Reg. 78766

Patent attorney

Farella Braun + Martel LLP

San Francisco, CA · 94104

415-954-4400

Jeffrey M Libby

Reg. 48251

Patent agent

Cupertino, CA · 95014

408-253-5431

Jelena J Libby

Reg. 64347

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

708-205-3766

Robert P Liburdy

Reg. 51947

Patent agent

Tiburon, CA · 94920

415-435-4119

Elliott Brussel Lieberman

Reg. 33414

Patent attorney

Morinelli and Lieberman

Oakland, CA · 94605

510-430-9366

Joe Liebeschuetz

Reg. 37505

Patent attorney

Alston & Bird LLP

East Palo Alto, CA · 94303

650-838-2038

Arnold W Lieman

Reg. 25693

Patent attorney

Palm Desert, CA · 92211

760-360-0304

Hien K. Lien

Reg. 75128

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

408-838-5219

Lawrence Lien

Reg. 64776

Patent attorney

Sunnyvale, CA · 94086

650-804-7800

Eric Lorne Lifschitz

Reg. 50538

Patent attorney

Law Offices of Eric L. Lifschitz

San Francisco, CA · 94102

415-553-6055

Maria Ligai

Reg. 78373

Patent agent

San Diego, CA · 92101

619-238-1900

Brian J. K. Ligh

Reg. 79273

Patent agent

Elk Grove, CA · 95624

916-690-5979

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.