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 KILPATRICK TOWNSEND & STOCKTON, LLP, Bayer CropScience LP, and U.S. Government.

Top cities in California

All practitioners in California

Michelle Lynn Samonek

Reg. 54421

Patent attorney

Bayer CropScience LP

Woodland, CA · 95695

916-475-6874

Arthur Kevin Samora

Reg. 43079

Patent attorney

U.S. Government

San Diego, CA · 92152-5765

619-767-4168

Theresa T Sample

Reg. 76970

Patent agent

Ionis Pharmaceuticals

Carlsbad, CA · 92010

760-603-2486

John W. Samples

Reg. 70407

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

San Francisco, CA · 94111

415-875-6600

Donny K. Samporna

Reg. 76604

Patent attorney

HG Law LLP

San Jose, CA · 95113

669-213-1080

Tamara Shields Sampsell

Reg. 52221

Patent attorney

Kinetic Counsel PC

San Diego, CA · 92130

858-794-9146

Elizabeth R Sampson

Reg. 52190

Patent agent

Forestville, CA · 95436

415-312-0068

Roger S Sampson

Reg. 44314

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612-0250

510-663-1100

Ehab M Samuel

Reg. 57905

Patent attorney

Orbit IP, LLP

Irvine, CA · 92614

310-887-1333

Allen R Samuels

Reg. 43899

Patent agent

San Jose, CA · 95138

408-270-3099

Richard Michael San Pietro

Reg. 45071

Patent attorney

San Diego, CA · 92124

858-292-9468

Peyman Sana

Reg. 66292

Patent agent

Planetsolar LLC

La Jolla, CA · 92037

321-662-7242

Erin Rae Sanchack

Reg. 50698

Patent attorney

United States District Court for the

San Diego, CA · 92101

619-557-3446

David B Sandelands· Jr

Reg. 46023

Patent attorney

Cislo & Thomas, LLP

Los Angeles, CA · 90025

310-451-0647

Catherine May Sanders

Reg. 50660

Patent agent

Castro Valley, CA · 94546

510-909-0132

Justin G. Sanders

Reg. 59398

Patent attorney

Master Key IP, LLP

Huntington Beach, CA · 92647

949-250-5800

Ryan A. Sanders

Reg. 79707

Patent attorney

Latham & Watkins LLP

San Francisco, CA · 94111

415-395-8185

Theresia Crary Sandhu

Reg. 44315

Patent attorney

Law Office of Theresia C. Sandhu

San Jose, CA · 95136

408-723-7600

Howard Eugene Sandler

Reg. 25370

Patent attorney

Attorney at Law

Laguna Hills, CA · 92653

949-643-0396

Lucero G. Sandoval

Reg. 84198

Patent agent

San Jose, CA · 95116

408-202-8235

Veronica Sandoval

Reg. 63643

Patent attorney

San Diego, CA · 92037

619-800-5837

Babak Sadegh Sani

Reg. 37495

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

San Francisco, CA · 94111

415-576-0200

Barmak S Sani

Reg. 45068

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

Menlo Park, CA · 94025

650-326-2400

David Vincent Sanker

Reg. 56242

Patent attorney

SankerIP

Union City, CA · 94587

510-714-5196

Tony Sanny

Reg. 53551

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-522-4225

Eleanor S. Sano

Reg. 76049

Patent attorney

Sony Electronics Inc.

San Diego, CA · 92127

909-569-3840

Kevin K. Sante

Reg. 70724

Patent agent

San Mateo, CA · 94403

650-201-8865

Ariana K. Santoro

Reg. 74338

Patent attorney

Omni Legal Group

Los Angeles, CA · 90024

310-276-6664

Elisa Santos

Reg. 83399

Patent attorney

Herbert Smith Freehills Kramer (US) LLP

Redwood City, CA · 94015

650-752-1700

Fernando I Santos· Jr.

Reg. 57822

Patent attorney

Bayer HealthCare LLC

Berkeley, CA · 94710

510-705-7725

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.