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 Amgen Inc., Google Inc., and Christie, Parker & Hale, LLP.

Top cities in California

All practitioners in California

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

Sean B. Mackenzie

Reg. 70687

Patent attorney

San Clemente, CA · 92673

949-248-3080

Douglas E MacKenzie

Reg. 38955

Patent agent

Del Rey Oaks, CA · 93940

831-277-6181

Robert C MacKichan· III

Reg. 65262

Patent agent

Oakland, CA · 94611

202-815-3448

Alexander Fraser MacKinnon

Reg. 35594

Patent attorney

Kirkland & Ellis LLP

Los Angeles, CA · 90071

213-680-8432

Kamrin Terrell MacKnight

Reg. 38230

Patent attorney

Codexis, Inc.

Redwood City, CA · 94063

650-421-8138

Albert Macovski

Reg. 26564

Patent agent

Palo Alto, CA · 94304

650-473-9163

Bassil G. Madanat

Reg. 71765

Patent attorney

Pasadena, CA · 91101

909-215-6026

Kian Madani Neishaboori

Reg. 81583

Patent agent

Kubota & Basol LLP

Los Angeles, CA · 90071

213-462-2619

Erin Madden

Reg. 46892

Patent agent

The J David Gladstone Institutes

San Francisco, CA · 94141

415-695-3732

Marguerite M Maddux

Reg. 50962

Patent agent

Waymo LLC

Mountain View, CA · 94043

650-265-7617

Divya U. Madhyasta

Reg. 79968

Patent agent

Campbell, CA · 95008

408-242-5398

Eric L. Madigan

Reg. 76405

Patent attorney

Arent Fox LLP

Los Angeles, CA · 90013

213-443-7663

Amy C. Madl

Reg. 76529

Patent attorney

Amgen Inc.

South San Francisco, CA · 94080

650-680-5990

Rajeev Madnawat

Reg. 57190

Patent attorney

NXP Semiconductors

San Jose, CA · 95134

408-518-5534

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.