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 Knobbe, Martens, Olson & Bear, LLP, Katz Ruby & Carle LLP, and Alston & Bird.

Top cities in California

All practitioners in California

Evelyn Escamilla

Reg. 82634

Patent attorney

Katz Ruby & Carle LLP

Costa Mesa, CA · 92626

213-561-4680

Joaquin Jose Diokno Escay

Reg. 76587

Patent agent

Alston & Bird

San Francisco, CA · 94105

415-243-1052

Mary M Eshaghian

Reg. 55157

Patent attorney

Los Angeles, CA · 90024

310-441-4402

Michael Eshaghian

Reg. 81057

Patent attorney

Mesh IP Law, PC

Van Nuys, CA · 91401

213-357-5668

Todd W. Esker

Reg. 46690

Patent attorney

Bozicevic, Field & Francis LLP

San Francisco, CA · 94105-3627

415-230-8152

Douglas B Espenschied

Reg. 66607

Patent attorney

Medtronic

Santa Rosa, CA · 95403

720-413-6981

Noemi C. Espinosa

Reg. 31949

Patent attorney

Los Altos, CA · 94024

650-248-1658

Carlos Espinoza

Reg. 71606

Patent attorney

Abbott

Sylmar, CA · 91342

818-362-6822

D. Benjamin Esplin

Reg. 58297

Patent attorney

Esplin & Associates, PC

Carlsbad, CA · 92008

760-206-3256

Daniel L Essig

Reg. 61575

Patent attorney

ASIC Law

Cardiff by the Sea, CA · 92007

760-809-1353

Melodie L Estabrook

Reg. 68150

Patent agent

Danisco US, Inc.

Palo Alto, CA · 94304

650-846-4016

John D. Esterhay

Reg. 73512

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130

858-720-5758

Ernest L. Estes

Reg. 76133

Patent agent

Dolby

San Francisco, CA · 94103

415-558-0200

Cesar A Estrada

Reg. 82901

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Megha Eswaran

Reg. 76406

Patent agent

San Jose, CA · 95113

408-278-4040

Jacob S. Etling

Reg. 82852

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

724-757-6817

Justin J. Eurek

Reg. 67590

Patent attorney

Kilpatrick, Townsend & Stockton, LLP

Menlo park, CA · 94025

650-326-2400

Eric J Evain

Reg. 42517

Patent attorney

Naval Air Warfare Center

China Lake, CA · 93555-6100

760-939-3481

Joseph R Evanns

Reg. 25676

Patent attorney

Evanns & Walsh

Beverly Hills, CA · 90211

310-273-0938

Emily Anne Evans

Reg. 33493

Patent attorney

Menlo Park, CA · 94025

650-327-4086

Larry W Evans

Reg. 22344

Patent attorney

L. W. Evans, Consultant

San Clemente, CA · 92673

949-218-4378

Laura E. Evans

Reg. 65364

Patent attorney

Beaumont, CA · 92223

909-534-3637

Linda Sue Evans

Reg. 33873

Patent attorney

La Jolla, CA · 92037

858-551-1606

Richard Wilson Evans

Reg. 33381

Patent attorney

Agilent Technologies, Inc

Santa Clara, CA · 95051-7201

408-553-3117

Scott M Evans

Reg. 52873

Patent agent

Visiogen Inc

Irvine, CA · 92618

714--30-7-9290

Susan T Evans

Reg. 38443

Patent agent

Nektar Therapeutics

San Francisco, CA · 94158

415-482-5300

Tamara Jennifer Yorita Evans

Reg. 53813

Patent attorney

Johnson & Johnson Surgical Vision, Inc.

Irvine, CA · 92618

714-247-8422

William M Evans

Reg. 68400

Patent attorney

Bristol-Myers Squibb

San Diego, CA · 92121

858-882-5600

Cassidy K Evaristo

Reg. 80676

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2260

Kevin C Evel-Kabler

Reg. 63090

Patent attorney

Fenwick and West LLP

San Francisco, CA · 94104

415-875-2352

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.