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 Wilson Sonsini Goodrich & Rosati, University of California, San Francisco, and Kramer Alberti Lim & Tonkovich LLP.

Top cities in California

All practitioners in California

Mora F Mattingly

Reg. 44909

Patent agent

University of California, San Francisco

San Francisco, CA · 94143-1209

415-502-1661

Robert C Mattson

Reg. 42850

Patent attorney

Kramer Alberti Lim & Tonkovich LLP

Burlingame, CA · 94010

703-585-6188

George S Matula

Reg. 51343

Patent agent

Calabasas, CA · 91302

818-880-5262

John E Mauk

Reg. 54579

Patent attorney

Life Technologies, Inc

Carlsbad, CA · 92008

760-603-7200

James J Maune

Reg. 67187

Patent attorney

San Diego, CA · 92121

949-491-5616

Jennifer A Mauri

Reg. 63279

Patent attorney

Michelman & Robinson, LLP

Irvine, CA · 92614

714-557-7990

Anthony P Mauro· II

Reg. 63702

Patent agent

San Diego, CA · 92129

858-357-7067

Thomas C Mavrakakis

Reg. 39763

Patent attorney

ServiceNow Inc.

Santa Clara, CA · 95054

650-804-7800

Lawrence A Maxham

Reg. 24483

Patent attorney

The Maxham Firm

Escondido, CA · 92025

760-975-3843

Walter G Maxwell

Reg. 25355

Patent attorney

Christie Parker and Hale LLP

Glendale, CA · 91209

626-795-9900

John M May

Reg. 26200

Patent attorney

Sierra Madre, CA · 91024

626-355-4607

Scott R. May

Reg. 79175

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130-3002

858-350-2365

Hans L Mayer

Reg. 71587

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Mika Mayer

Reg. 47777

Patent attorney

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5000

Theodore M Mayer

Reg. 78910

Patent agent

Los Angeles, CA · 90025

973-626-1119

Scott S Maynard

Reg. 51223

Patent agent

Howrey Simon Arnold & White LLP

Irvine, CA · 92614-8200

949-721-6900

Joseph J Mayo

Reg. 53288

Patent agent

ARC IP Law, PC

La Jolla, CA · 92037

858-442-5877

Christopher Donald Mays

Reg. 61217

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304-1050

650-493-9300

Robert A. Mayville

Reg. 75853

Patent attorney

Law Offices of Gavin M. Hughes

Sacramento, CA · 95864

916-900-8022

Michael J Mazza

Reg. 30775

Patent attorney

El DoraDO hILLS, CA · 95762

650-283-6790

Robert V. Mazzola

Reg. 74445

Patent attorney

Pied Parker, Inc

Palo Alto, CA · 94306

949-209-7603

Laurie K Mc Namara

Reg. 66650

Patent attorney

Wilson Sonsini Goodrich and Rosati, PC

San Diego, CA · 92130-3002

858-350-2369

Paul M McAdams

Reg. 60598

Patent attorney

Qualcomm Incorporated

Santa Clara, CA · 95051

408-546-1361

Christopher S McAllister

Reg. 63873

Patent agent

San Diego, CA · 92122

858-534-4625

Isabelle Rodriguez McAndrews

Reg. 34998

Patent attorney

Fremont, CA · 94539

Kevin Patrick McAndrews

Reg. 34496

Patent agent

KLA - Tencor Corp.

Milpitas, CA · 95035

408-875-5990

Robert S McArthur

Reg. 45674

Patent attorney

San Francisco, CA · 94121

415-669-0630

Kenneth Iain McAusland

Reg. 37980

Patent attorney

Tucker Ellis, LLP

San Francisco, CA · 94105

415-617-2400

Cozette M. McAvoy

Reg. 60457

Patent attorney

Amyris, Inc.

Emeryville, CA · 94608

510-450-0761

Nola Mae McBain

Reg. 35782

Patent attorney

XEROX Corporation

Palo Alto, CA · 94304

650-812-4264

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.