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 Morgan, Lewis & Bockius LLP, Lynch LLP, and Lynn & Lynn.

Top cities in California

All practitioners in California

Matthew Patrick Lynch

Reg. 22357

Patent attorney

Winnetka, CA · 91306

818-898-0020

Morgan T. Lynch

Reg. 81008

Patent agent

Agoura Hills, CA · 91301

818-235-8945

Sean M. Lynch

Reg. 75248

Patent attorney

Lynch LLP

Los Angeles, CA · 90027

949-829-2186

John Hubert Lynn

Reg. 29235

Patent attorney

Lynn & Lynn

Irvine, CA · 92612

949-786-2372

Rebecca A Lynn

Reg. 55412

Patent agent

San Francisco, CA · 94129

415-422-0747

Katrina A Lyon

Reg. 42821

Patent attorney

Naval Surface Warfare Center, Port Hueneme Division

Port Hueneme, CA · 93043

805-469-5686

Richard Edgar Lyon· Jr

Reg. 26300

Patent attorney

Holland and Knight LLP

Los Angeles, CA · 90071

213-896-2510

Richard T Lyon· Jr

Reg. 37385

Patent attorney

Lyon and Harr LLP

Camarillo, CA · 93010

805-384-6435

Robert Edward Lyon

Reg. 24171

Patent attorney

Robert E. Lyon, Attorney at Law

Los Angeles, CA · 90017

213-622-7208

Adrian R. Lyons

Reg. 81898

Patent attorney

San Diego, CA · 92109

760-563-2621

Michael J Lyons

Reg. 37386

Patent attorney

Morgan, Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-7507

Shirly N Lyubomirsky

Reg. 40233

Patent attorney

The Patent Law Office of

Pleasanton, CA · 94588

925-223-7944

Dennis H Ma

Reg. 46890

Patent attorney

State of California Superior Court, County of Orange

Santa Ana, CA · 92701

657-622-7076

Jerome Ma

Reg. 71833

Patent attorney

Tensegrity Law Group LLP

Redwood Shores, CA · 94065

650-802-6022

Jerry Z. Ma

Reg. 79174

Patent attorney

Perplexity AI

San Francisco, CA · 94104

510-270-0840

Kun Ma

Reg. 73846

Patent agent

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105-1596

415-442-1000

Lin Ma

Reg. 64569

Patent agent

Nokia

San Diego, CA · 92127

858-603-1184

Michelle R Ma

Reg. 74832

Patent attorney

Latham & Watkins

Menlo Park, CA · 94025

408-623-6932

Michelle C Ma

Reg. 67897

Patent agent

Wilson Sonsini Goodrich & Rosati PC

Palo Alto, CA · 94304

650-849-3177

Patrick W Ma

Reg. 44215

Patent attorney

White & Case, LLP

Palo Alto, CA · 94306

650-213-0300

Sandy Ma

Reg. 71510

Patent agent

Foley & Lardner, LLP

San Diego, CA · 92130

858-847-6763

Warren W Ma

Reg. 65498

Patent agent

Huntington Beach, CA · 92646

714-330-6848

Wensheng Ma

Reg. 80420

Patent attorney

Mauriel Kapouytian Woods LLP

San Francisco, CA · 94111

415-738-6228

Xin Ma

Reg. 57555

Patent agent

San Mateo, CA · 94403

650-638-0200

Yufeng Ma

Reg. 56975

Patent attorney

Orrick, Herrington & Sutcliffe, LLP

Irvine, CA · 92614-8255

862-161-097108

Zhigang Ma

Reg. 76258

Patent agent

Baker Botts LLP

San Francisco, CA · 94111

415-291-6239

Lew Edward V Macapagal

Reg. 55416

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

714-453-9824

Dexter M. Macaranas

Reg. 59579

Patent agent

San Francisco, CA · 94103

408-421-5051

Marley M. Macarewich

Reg. 83086

Patent agent

Morrison Foerster

San Francisco, CA · 94105-2482

415-268-7000

John M Macaulay

Reg. 44886

Patent agent

RadiSurf, Inc.

Cupertino, CA · 95014

530-304-9010

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.