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 Stradling Yocca Carlson & Rauth, Weems Law Offices, and Law Offices of Gayani Weerasinghe.

Top cities in California

All practitioners in California

Chinling Wee

Reg. 72058

Patent agent

Santa Clara, CA · 95055

408-250-9589

Robert C Weems

Reg. 37754

Patent attorney

Weems Law Offices

Fairfax, CA · 94930

415-881-7653

Gayani Rangika Weerasinghe

Reg. 73487

Patent attorney

Law Offices of Gayani Weerasinghe

San Diego, CA · 92121

858-247-1886

Claire C Weglarz

Reg. 55716

Patent attorney

Harrington Foxx Dubrow & Canter, LLP

Los Angeles, CA · 90017

213-489-3222

David T. Wei

Reg. 58088

Patent attorney

Menlo Park, CA · 94025

415-305-1922

Ellen Y. Wei

Reg. 64327

Patent attorney

Wei & Sleman, LLP

Sunnyvale, CA · 94085

650-434-3565

Ming Wei

Reg. 51165

Patent agent

Los Altos, CA · 94024

408-464-1058

Shih-Hao Wei

Reg. 68631

Patent attorney

SantaFe Spring, CA · 90670

626-271-4788

Teng Sing Wei

Reg. 77082

Patent agent

Intuitive Surgical Inc.

Sunnyvale, CA · 94086

408-523-2100

Willa L. Wei

Reg. 69871

Patent attorney

Van Pelt, Yi & James LLP

Cupertino, CA · 95014

408-207-4772

Kevin J. Weichbrod

Reg. 65941

Patent attorney

Santa Barbarba District Attorney's Office

Santa Barbara, CA · 93101

805-568-2437

Leigh Ann Weiland

Reg. 37256

Patent attorney

Law Office of LeighAnn Weiland

Redwood City, CA · 94065

650-799-3065

George M Weinberg

Reg. 54532

Patent agent

Daly City, CA · 94014

415-337-1049

Howard L Weinberg

Reg. 34989

Patent attorney

Law Office of Howard Weinberg

Davis, CA · 95617-0716

916-213-7611

Lisa Prechter Weinberg

Reg. 33290

Patent agent

Moorpark, CA · 93021

805-501-4568

Michael F Weinberg

Reg. 84744

Patent agent

Encino, CA · 91316

818-564-0638

Elizabeth S Weiner

Reg. 68854

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

650-335-4918

Ethan M. Weiner

Reg. 73258

Patent attorney

Morrison & Foerster, LLP

Palo Alto, CA · 94304

650-813-4119

Steven S Weiner

Reg. 38360

Patent attorney

SRI International Avenue

Menlo Park, CA · 94025

650-859-3279

Paul W. Weingarten

Reg. 79337

Patent agent

Anaheim, CA · 92807

714-801-7018

Erin E. Weinlick

Reg. 56239

Patent agent

Biolinq, Inc.

San Diego, CA · 92121

610-883-3404

Kelsey S. Weinman

Reg. 83096

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Daniel W Weinstein

Reg. 53753

Patent agent

Los Angeles, CA · 90036

323-930-1712

Les J Weinstein

Reg. 19625

Patent attorney

Los Angeles, CA · 90049

310-476-0655

Peter D Weinstein

Reg. 43251

Patent attorney

One3 IP Management P.C.

Newbury Park, CA · 91320

805-444-7865

Veronica Weinstein

Reg. 43252

Patent attorney

Mountain View, CA · 94040

415-378-2994

Nicholas M Weinstock

Reg. 65142

Patent attorney

Qualcomm, Inc.

San Diego, CA · 92129

858-651-8530

Jan Patrick Weir

Reg. 43253

Patent attorney

Stradling Yocca Carlson & Rauth

Newport Beach, CA · 92660

949-725-4000

Kathrine J Weir

Reg. 66877

Patent attorney

Stradling Yocca Carlson & Rauth

Newport Beach, CA · 92660

949-725-4270

Berthold J Weis

Reg. 22851

Patent agent

Livermore, CA · 94551

925-449-4994

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.