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 Beyer Law Group LLP, Law Office of Donald L. Wenskay, and Knobbe, Martens, Olson & Bear, LLP.

Top cities in California

All practitioners in California

Chen-Yun Weng

Reg. 800067

Limited recognition

Beyer Law Group LLP

Palo Alto, CA · 94303

650-842-1300

Deborah W Wenocur

Reg. 40221

Patent agent

Palo Alto, CA · 94306

650-493-3849

Donald L Wenskay

Reg. 32661

Patent attorney

Law Office of Donald L. Wenskay

Rancho Santa Fe, CA · 92067

858-736-4227

Douglas B. Wentzel

Reg. 74897

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Kelsey Werdall

Reg. 81185

Patent attorney

San Diego, CA · 92130

858-910-4780

Kipman T Werking

Reg. 60187

Patent attorney

VLP Law Group

Palo Alto, CA · 94301

650-251-4218

Robert A Werner

Reg. 68297

Patent attorney

Fisker Inc

Manhattan Beach, CA · 90266

508-369-3867

Imani M Wesley

Reg. 58613

Patent attorney

Law Office of Imani M. Wesley

Emeryville, CA · 94662-9144

510-655-4808

Andrea N. West

Reg. 83592

Patent agent

Arnold, CA · 95223

310-740-2025

Christopher W West

Reg. 74724

Patent attorney

Amgen, Inc

Thousand Oaks, CA · 91320

919-906-5228

Robert M West

Reg. 29599

Patent attorney

Law Offices of R. Michael West , PC

Sacramento, CA · 95811

916-444-5444

Stuart J West

Reg. 43258

Patent attorney

West & Associates, A PC

Walnut Creek, CA · 94598

925-262-2220

Derek J Westberg

Reg. 40872

Patent attorney

Westberg Law Offices

Mountain View, CA · 94043

650-968-0410

Stephen M Westbrook

Reg. 26050

Patent attorney

Novato, CA · 94945

415-897-3970

Joanne M Westendorf

Reg. 53762

Patent agent

Palo Alto, CA · 94303

650-329-1425

Laura C. Westergard

Reg. 81738

Patent attorney

MORRISON FOERSTER LLP

San Diego, CA · 92130

858-720-5100

Timothy S. Westhoelter

Reg. 65597

Patent attorney

Law Office of Timothy S. Westhoelter

Berkeley, CA · 94702

925-895-7581

Cameron W Westin

Reg. 66188

Patent attorney

O'Melveny & Myers LLP

Newport Beach, CA · 92660

949-823-7987

Lorelei P Westin

Reg. 52353

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2225

Ray D Weston· Jr

Reg. 40873

Patent attorney

Taco Bell Corp.

Irvine, CA · 92614

949-863-4676

Mark Westwood

Reg. 77930

Patent agent

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5005

Cort Wetherald

Reg. 67723

Patent agent

Kilpatrick Townsend

San Diego, CA · 92130

858-351-6150

Alexander L Wettermann

Reg. 75166

Patent agent

CoinList

San Francisco, CA · 94133

847-767-5229

Thain H. Wey

Reg. 75811

Patent agent

Santa Maria, CA · 93455

805-363-5745

Markus D Weyde

Reg. 65416

Patent attorney

Fish & Richardson

San Diego, CA · 92130

858-678-4351

Frank M Weyer

Reg. 33050

Patent attorney

Techcoastlaw

Los Angeles, CA · 90068

310-494-6616

Sean D Whaley

Reg. 65834

Patent attorney

Arent Fox LLP

San Francisco, CA · 94105

415-757-5906

Alex Gilmore Whaples

Reg. 901800

Limited recognition

University of San Diego School of Law

San Diego, CA · 92110

IIona M Wheat

Reg. 70746

Patent attorney

San Diego, CA · 92130

412-759-4361

Andrea M. Wheeler

Reg. 73780

Patent agent

Cypress Semiconductor Corporation

San Jose, CA · 95125

408-545-6904

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.