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 Fountainhead Law Group, PC, Lewis Brisbois Bisgaard & Smith LLP, and Thermo Fisher Scientific Inc..

Top cities in California

All practitioners in California

Crystal C Yee

Reg. 73175

Patent agent

San Francisco, CA · 94159

415-830-3616

Darren Yee

Reg. 72794

Patent agent

Alameda, CA · 94501

781-690-8242

George B F Yee

Reg. 37478

Patent attorney

Fountainhead Law Group, PC

Santa Clara, CA · 95050

408-260-8172

Jeffrey F Yee

Reg. 56605

Patent attorney

Lewis Brisbois Bisgaard & Smith LLP

Los Angeles, CA · 90071

213-250-1800

Steven M. Yee

Reg. 63233

Patent attorney

Thermo Fisher Scientific Inc.

Carlsbad, CA · 92008

760-918-3850

Susan Yee

Reg. 41388

Patent attorney

Schwegman, Lundberg & Woessner, P.A.

San Jose, CA · 95113

408-278-4057

William K Yee

Reg. 54943

Patent attorney

Arista Networks, Inc.

Santa Clara, CA · 95054

408-547-5576

Yen Sung Yee

Reg. 29729

Patent attorney

Irvine, CA · 92614

949-436-9670

Jennifer Thanh Yeh

Reg. 50175

Patent attorney

Atherton, CA · 94027

415-244-7986

Jenny J Yeh

Reg. 60610

Patent attorney

Pfizer Inc.

South San Francisco, CA · 94080

650-615-7451

Ka Lo Yeh

Reg. 74139

Patent attorney

Applied Materials

Santa Clara, CA · 95054-3299

408-806-8146

Luke J Yeh

Reg. 43296

Patent attorney

Snapchat, Inc.

Venice, CA · 90291

Mark Y Yeh

Reg. 73320

Patent attorney

KPPB LLP

Anaheim, CA · 92806

949-852-0000

Robert M C Yeh

Reg. 61029

Patent attorney

Latham & Watkins LLP

San Diego, CA · 92130

858-523-5469

Bing K Yen

Reg. 52385

Patent agent

Cupertino, CA · 95015

408-455-5447

Jerry T Yen

Reg. 61412

Patent attorney

California Department of Justice

Sacramento, CA · 95814

916-210-7836

Linda Yen

Reg. 81953

Patent agent

Morrison and Foerster

Palo Alto, CA · 94301

650-813-5600

Shannon Y. Yen

Reg. 52386

Patent attorney

Palo Alto, CA · 94306

408-921-2700

Terence Yen

Reg. 77376

Patent agent

Oceanside, CA · 92058

760-435-7011

William Paul Yeromian

Reg. 901020

Limited recognition

Thomas Jefferson School of Law

San Diego, CA · 92101

818-919-5822

Adrienne Yeung

Reg. 44000

Patent attorney

Technology & Innovation Law Group, PC

Cupertino, CA · 95014

408-252-9991

Bonny G Yeung

Reg. 53811

Patent attorney

Genentech Inc.

South San Francisco, CA · 94080

650-640-7861

Derek W Yeung

Reg. 57472

Patent attorney

LOZA & LOZA, LLP

Upland, CA · 91786

714-453-9824

Tsz Lung Yeung

Reg. 66189

Patent attorney

Monterey Park, CA · 91754

626-478-8115

Seungjoo Yi

Reg. 84298

Patent agent

Nitto Denko Technical Corporation

Oceanside, CA · 92058

760-435-7011

Susan C Yi

Reg. 39883

Patent attorney

Van Pelt & Yi, LLP

Cupertino, CA · 95014

408-973-2585

Anthony S Yim

Reg. 59866

Patent attorney

KCDA

Bakersfield, CA · 93301

661-868-2340

Peter Jung-Huyn Yim

Reg. 44417

Patent attorney

Dentons US LLP

San Francisco, CA · 94105-1101

415-267-4000

Susanne C Yim

Reg. 62203

Patent attorney

San Francisco, CA · 94116

415-566-3388

Bu Yin

Reg. 68930

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2377

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.