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 Angiogenix, Inc., Manatt, Phelps & Phillips, LLP, and Lapple Ubell IP Law, LLP.

Top cities in California

All practitioners in California

Maria Louisa Lao

Reg. 55358

Patent agent

San Jose, CA · 95112

516-578-2974

Mariette A Lapiz

Reg. 44202

Patent agent

Angiogenix, Inc.

Burlingame, CA · 94010

650-552-0766

Lawrence R LaPorte

Reg. 38948

Patent attorney

Manatt, Phelps & Phillips, LLP

Los Angeles, CA · 90064-1631

310-312-4000

Matthew C Lapple

Reg. 44203

Patent attorney

Lapple Ubell IP Law, LLP

Irvine, CA · 92612

949--75-6-4889

Alan G. Laquer

Reg. 63635

Patent attorney

Knobbe Martens

Irvine, CA · 92614

949-760-0404

Samuel W. Lardy

Reg. 79062

Patent agent

La Jolla, CA · 92037

612-961-3321

Craig C Largent

Reg. 56400

Patent attorney

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Hannah G. Largoza

Reg. 80459

Patent agent

Duarte, CA · 91010

323-673-1374

Sonia Lari

Reg. 67142

Patent attorney

Revelyst Operations LLC

Irvine, CA · 92606

760-930-5203

Kristoffer S Larsen

Reg. 66860

Patent agent

Orangvale, CA · 95662

415-506-7676

Michael J Larsen

Reg. 66280

Patent agent

Coastal Patent, LLC

San Diego, CA · 92193

858-565-4730

Christopher L Larson

Reg. 68243

Patent attorney

Fenwick & West LLP

San Francisco, CA · 94104

415-875-2300

David L Larson

Reg. 37663

Patent attorney

McDermott Will & Emery

Menlo Park, CA · 94025

650-815-7472

Douglas Norman Larson

Reg. 29401

Patent attorney

Calabasas, CA · 91302

818-517-8734

Jacqueline Susanna Larson

Reg. 30279

Patent attorney

Law Office of Jacqueline S. Larson

Alameda, CA · 94502

510-749-4842

Kaare D Larson

Reg. 51920

Patent attorney

DexCom, Inc.

San Diego, CA · 92121

858-200-0204

Stephen W Larson

Reg. 69133

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

David J Larwood

Reg. 33191

Patent attorney

Wooside, CA · 94062

650-363-0362

Michael Barry Lasky

Reg. 29555

Patent attorney

Altera Law Group

Oxnard, CA · 93035

206-279-7564

Irfan A Lateef

Reg. 51922

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-721-7672

Roy Westlake Latham

Reg. 29820

Patent agent

CGSD Corporation

Mountain View, CA · 94043

415-903-4920

Thomas W Lathram

Reg. 50618

Patent attorney

Silicon Edge Law Group LLP

Pleasanton, CA · 94566

925-837-4185

Bruce D Lathrop

Reg. 41929

Patent attorney

Empirical Systems Aerospace, Inc.

San Luis Obispo, CA · 93401

805-275-1053

Daniel L Latimer

Reg. 74996

Patent agent

Los Angeles, CA · 90020

310-498-3939

Robert T Latta

Reg. 67628

Patent attorney

Jones Day

San Diego, CA · 92121

858-314-1140

Christopher W Lattin

Reg. 56064

Patent attorney

Xperi Corporation

San Jose, CA · 95134

408-321-6069

Robert L Lattuga

Reg. 39265

Patent agent

LeapFrog Enterprises, Inc.

Emeryville, CA · 94608-1070

510-420-4353

Billy Y Lau

Reg. 40248

Patent agent

Walnut, CA · 91789

626-922-5500

Hiu W. Lau

Reg. 75415

Patent agent

Morrison & Foerster LLP

San Diego, CA · 92130-2040

858-314-5439

Lawrence M Lau

Reg. 60833

Patent attorney

San Francisco, CA · 94122

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.