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 Nokia, Wilson Sonsini Goodrich & Rosati PC, and Latham & Watkins.

Top cities in California

All practitioners in California

Lin Ma

Reg. 64569

Patent agent

Nokia

San Diego, CA · 92127

858-603-1184

Michelle C Ma

Reg. 67897

Patent agent

Wilson Sonsini Goodrich & Rosati PC

Palo Alto, CA · 94304

650-849-3177

Michelle R Ma

Reg. 74832

Patent attorney

Latham & Watkins

Menlo Park, CA · 94025

408-623-6932

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

James William Maccoun

Reg. 35592

Patent attorney

Google Inc.

Mountain View, CA · 94043

650-308-9868

Michael John MacDermott

Reg. 29946

Patent attorney

Christie, Parker & Hale, LLP

Glendale, CA · 91203-1445

626-795-9900

Gregory M. MacDonald

Reg. 71764

Patent attorney

Alameda, CA · 94501

510-521-1984

Christina A MacDougall

Reg. 65210

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1277

Andrew C. Mace

Reg. 63342

Patent attorney

Cooley LLP

Palo Alto, CA · 94304

650-843-5808

Theodore Stephen Maceiko

Reg. 35593

Patent attorney

Maceiko IP

Manhattan Beach, CA · 90266

310-545-3311

Kyong H Macek

Reg. 42977

Patent agent

Qualcomm, Inc.

San Diego, CA · 92121

858-651-5797

Monique Macek

Reg. 63547

Patent agent

Mintz Levin

San Diego, CA · 92130

858-314-1500

Harry J Macey

Reg. 32818

Patent attorney

Law Office of Harry J Macey

Sausaltio, CA · 94966

415-518-9738

Nathan A Machin

Reg. 47763

Patent attorney

Amgen Inc.

South San Francisco, CA · 94080

650-244-3140

Donald Norman MacIntosh

Reg. 20316

Patent attorney

Menlo Park, CA · 94025

650-619-6740

Brian E Mack

Reg. 57189

Patent attorney

Quinn Emanuel Urquhart & Sullivan LLP

San Francisco, CA · 94111

415-875-6600

James F Mack

Reg. 74196

Patent attorney

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-4207

Joshua A Mack

Reg. 60520

Patent attorney

Halozyme

San Diego, CA · 92130

858-794-8889

Kevin J Mack

Reg. 56224

Patent attorney

Dolby Laboratories, Inc.

San Francisco, CA · 94103

415-645-5065

Katherine J Mackenzie

Reg. 74563

Patent agent

Genentech, Inc.

South San Francisco, CA · 94080

650-467-2292

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.