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 Sheppard Mullin, Becton, Dickinson and Company, and O'Melveny & Myers LLP.

Top cities in California

All practitioners in California

Ethan M Dietrich

Reg. 56949

Patent attorney

Los Angeles, CA · 90068

215-805-3856

Peter S. Diez

Reg. 76132

Patent agent

Sheppard Mullin

Palo Alto, CA · 94301

650-815-1939

Manali V Dighe

Reg. 56856

Patent attorney

Santa Cruz, CA · 95060

707-731-3817

Christopher M. DiLeo

Reg. 61738

Patent attorney

Becton, Dickinson and Company

San Diego, CA · 92130

858-617-3933

Nathaniel L Dilger

Reg. 42485

Patent attorney

O'Melveny & Myers LLP

Newport Beach, CA · 92660

949-760-9600

David A Dillard

Reg. 30831

Patent attorney

Christie Parker & Hale, LLP

Glendale, CA · 91203-1445

626-795-9900

Thomas R Dillof

Reg. 63900

Patent attorney

San Diego, CA · 92104

646-729-4085

Harrison F Dillon

Reg. 45661

Patent agent

Solazyme, Inc.

South San Francisco, CA · 94080

650-780-4778

Samuel A Dillon

Reg. 65197

Patent attorney

Apple Inc.

Cupertino, CA · 95014

408-529-2393

Guy J. DiMauro

Reg. 79745

Patent agent

Beckman Coulter

Brea, CA · 92821

949-291-3516

Yekun Ding

Reg. 78699

Patent agent

Santa Cruz, CA · 95064

831-502-1398

Yi Ding

Reg. 65025

Patent agent

San Jose, CA · 95111

408-585-8140

Joshua S Dingott

Reg. 69540

Patent attorney

Hewlett Packard Enterprise

Palo Alto, CA · 94304

512-319-0257

Chi N Dinh

Reg. 68413

Patent attorney

Hayward, CA · 94545

510-786-1871

Truong Dinh

Reg. 40993

Patent agent

Dinh & Associates

Penngrove, CA · 94951

650-289-0600

Peter W Dini

Reg. 52821

Patent attorney

Sorrento

San Diego, CA · 92121

617-320-3360

Alanna N. Dion

Reg. 58745

Patent attorney

Tailored Shared Services, LLC.

Fremont, CA · 94538

510-723-8641

Christen G DiPetrillo

Reg. 73789

Patent attorney

Parker Institute for Cancer Immunotherapy

San Francisco, CA · 94129

628-899-7600

Eric A Dippel

Reg. 48890

Patent attorney

Campbell, CA · 95008

408-370-3624

Sara E Dirvianskis

Reg. 62613

Patent agent

Danville, CA · 94526

925-408-3365

Charles E Dispenzieri

Reg. 71931

Patent attorney

Sempra Energy

San Diego, CA · 92101

619-696-4856

Michael J Dix

Reg. 51621

Patent agent

San Jose, CA · 95124

408-267-0139

Cynthia Anne Dixon

Reg. 58926

Patent attorney

Polsinelli LLP

Los Angeles, CA · 90067

310-203-5355

John E Dixon

Reg. 51332

Patent attorney

John E. Dixon, Attorney at Law

Thousand Oaks, CA · 91360

805-499-4788

Jonathan V. Dixon

Reg. 47229

Patent attorney

CareFusion

San Diego, CA · 92130

858-617-3807

Igor Djokovic

Reg. 55118

Patent agent

Aktino Inc.

Irvine, CA · 92612

949-258-0545 X238

Cameron Thomas Djokovich

Reg. 74397

Patent attorney

Floratos, Loll & Devine

Mission Viejo, CA · 92691

714-641-1222

Caroline T Do

Reg. 47529

Patent attorney

Canon USA, Inc.

Irvine, CA · 92618

949-932-3135

Elizabeth T. Do

Reg. 84446

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

415-217-8394

Jamie P. Do

Reg. 84406

Patent agent

San Diego, CA · 92122

760-685-4808

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.