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, M&H, LLP, and The Walt Disney Company.

Top cities in California

All practitioners in California

Tony Chan

Reg. 77619

Patent agent

M&H, LLP

Menlo Park, CA · 94025

650-331-7008

Katy K Chan-Parsons

Reg. 71775

Patent agent

The Walt Disney Company

Burbank, CA · 91521

929-618-7923

Janet D Chance

Reg. 55048

Patent agent

Kokka & Hsu, PC

Mountain View, CA · 94043

650-428-0312

Paul D Chancellor

Reg. 52715

Patent attorney

Ocean Law

Simi Valley, CA · 93063

805-368-4586

Wayne M Chancellor

Reg. 51249

Patent attorney

Composite Optics INC

San Diego, CA · 92121

858-621-6956

Paige N Chandler

Reg. 78321

Patent attorney

Morrison Foerster

San Diego, CA · 92121-3134

858-314-5424

Sterling W Chandler

Reg. 51370

Patent attorney

Ladas & Parry, LLP

Los Angeles, CA · 90036

323-934-2300

Theodore W Chandler

Reg. 50319

Patent attorney

Baker Botts L.L.P.

Los Angeles, CA · 90067

213-202-5702

Shweta Chandra

Reg. 61379

Patent agent

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Srividya R. Chandramouli

Reg. 78278

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

850-649-3121

Chitrajit Chandrashekar

Reg. L0896

Limited recognition

Procopio, Cory, Hargreaves, and Savitch LLP

Palo Alto, CA · 94306

650-645-9000

Alan Chang

Reg. 68800

Patent agent

Chino, CA · 91710

909-618-8671

Alexander J. Chang

Reg. 67586

Patent attorney

Ardent Law Group, P.C.

Irvine, CA · 92612

949-863-9782

Andrew L. Chang

Reg. 75298

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

415-547-0016

Ardith Chang

Reg. 47482

Patent agent

San Diego, CA · 92109

858-663-8225

Arthur C. Chang

Reg. 77667

Patent agent

Irvine, CA · 92604

213-840-1422

Audrey B Chang

Reg. 69800

Patent agent

Berkeley, CA · 94703

510-845-7169

Benjamin S Chang

Reg. 56044

Patent attorney

San Diego, CA · 92103

866-285-2427

Brian C Chang

Reg. 74301

Patent attorney

Danville, CA · 94526

209-814-1649

Chi-Hsin Chang

Reg. 52717

Patent agent

Apple Inc.

Cupertino, CA · 95014

408-862-3597

Christine S. Chang

Reg. 55050

Patent attorney

Bogle & Chang

Van Nuys, CA · 91411

310-734-6233

Cindy Chang

Reg. 69826

Patent attorney

Denali Therapeutics Inc.

South San Francisco, CA · 94080-1910

650-580-1032

Clifford S. Chang

Reg. 69492

Patent attorney

Fremont, CA · 94539

510-299-7025

Dale Chang

Reg. 61476

Patent agent

Russ August & Kabat

Los Angeles, CA · 90025

310-826-7474

David J Chang

Reg. 50374

Patent agent

Roche Molecular System, Inc.

Pleasanton, CA · 94588

925-730-8565

Emil Chun-Ning Chang

Reg. 37593

Patent attorney

Venture Pacific Law, PC

Santa Clara, CA · 95054

408-988-9898 X111

Eric W. Chang

Reg. 76511

Patent agent

Walnut, CA · 91789

909-576-3023

Evelyn Y. Chang

Reg. 70955

Patent attorney

10x Genomics, Inc.

Pleasanton, CA · 94588

Evelyn L Chang

Reg. 79051

Patent attorney

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-4033

Hak J Chang

Reg. 56319

Patent agent

Capella Biosciences, Inc.

Palo Alto, CA · 94301

617-308-5006

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.