California

Patent attorneys in California

California hosts 9,567 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 Rigel Pharmaceuticals Inc., Dunn Desantis Walt & Kendrick LLP, and Denali Therapeutics Inc..

Top cities in California

All practitioners in California

Alek Charles Emery

Reg. 79444

Patent attorney

Glendale, CA · 91203

801-674-0888

Jasenka Eminovic

Reg. 77358

Patent attorney

Rigel Pharmaceuticals Inc.

South San Francisco, CA · 94080

408-422-1202

Joshua L. Emory

Reg. 60215

Patent attorney

Dunn Desantis Walt & Kendrick LLP

San Diego, CA · 92101

619-573-4488

Hugo M Eng

Reg. 50840

Patent agent

Denali Therapeutics Inc.

South San Francisco, CA · 94080

650-457-4333

Um Ping Peter Eng

Reg. 39666

Patent attorney

Wilson Sonsini Goodrich and Rosati

Palo Alto, CA · 94305

650-493-9300

Jennifer K Engelhardt

Reg. 52861

Patent agent

Escondido, CA · 92029

760-745-9424

Timur S W Engin

Reg. 46686

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080-4990

650-467-2528

Alan E Engle

Reg. 57230

Patent attorney

Meador & Engle

Seal Beach, CA · 90740

310-428-6985

Matthew J Engle

Reg. 42513

Patent attorney

Burlingame, CA · 94010

650-344-7931

William Andrew English

Reg. 42515

Patent attorney

Vista IP Law Group LLP

Fullerton, CA · 92835

714-449-8433

Woodrow Douglas English· III

Reg. 30746

Patent attorney

English & Associates

Ventura, CA · 93003

805-642-2025

Edu E Enin-Okut

Reg. 52864

Patent attorney

Naval Air Warfare Center Weapons Division (NAWCWD)

China Lake, CA · 93555

760-939-1340

Brenda H. Entzminger

Reg. 76896

Patent attorney

San Francisco, CA · 94123

415-425-5230

Ryan J. Eom

Reg. 83973

Patent agent

Fullerton, CA · 92832

720-884-6440

Timothy L Epp

Reg. 38768

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Costa Mesa, CA · 92626-1925

714-513-5100

Kyle Eppele

Reg. 34155

Patent attorney

Office of the General Counsel

San Diego, CA · 92152

619-553-3823

Dennis Harley Epperson

Reg. 32025

Patent attorney

Law Office of Dennis H Epperson

Santa Barbara, CA · 93111

805-964-5814

Eli Zachary Epperson

Reg. 77937

Patent agent

Fish & Richardson, P.C.

Redwood City, CA · 94063

215-435-4423

Christopher K Eppich

Reg. 52868

Patent attorney

Covington & Burling LLP

San Diego, CA · 92122

858-678-1805

Natan Epstein

Reg. 28997

Patent attorney

Law Offices Of Natan Epstein

Los Angeles, CA · 90064

310-312-2900

Saul Epstein

Reg. 25449

Patent attorney

Sherman Oaks, CA · 91403

818-789-5346

Alfred A Equitz

Reg. 30922

Patent attorney

Girard & Equitz LLP

San Francisco, CA · 94116

415-566-2100

David Edward Eramian

Reg. 60814

Patent agent

Stripe, Inc.

San Francisco, CA · 94110

415-926-5809

Richard S Erbe

Reg. 34814

Patent attorney

The Law Office Of Richard S Erbe

Simi Valley, CA · 93063

805-807-1352

Andrew R. Ericks

Reg. 83369

Patent agent

Dinsmore & Shohl LLP

San Diego, CA · 92101

619-400-0454

Don Erickson

Reg. 38873

Patent agent

Law Office

Oceanside, CA · 92054

760-438-8842

Alper T Ertas

Reg. 70799

Patent attorney

Thermo Fisher Scientific Inc.

Carlsbad, CA · 92008-7321

760-476-7785

Gamze Erten

Reg. 66915

Patent agent

Raytheon

El Segundo, CA · 90245

310-661-8563

Tamara Escajadillo

Reg. 77195

Patent agent

San Diego, CA · 92120

619-313-8845

Sharon Escalona-Olsen

Reg. 52871

Patent attorney

Law Offices of Sharon Escalona-Olsen

Hawthorne, CA · 90250

310-978-6064

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?

9,567 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.