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 Morgan, Lewis & Bockius LLP, Weaver Austin Villeneuve & Sampson, LLP, and Qualcomm Incorporated.

Top cities in California

All practitioners in California

Francesco N. Mangini

Reg. 79547

Patent agent

Weaver Austin Villeneuve & Sampson, LLP

Oakland, CA · 94612-0250

510-663-1100

Alexander M. Mann

Reg. 76694

Patent attorney

San Diego, CA · 92122

858-900-7228

Gary Dean Mann

Reg. 34867

Patent attorney

Sherman Oaks, CA · 91403

818-599-0517

Jeffry S Mann

Reg. 42837

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1000

Liberty Edward Mann· IV

Reg. 61397

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-3233

Robert W Mann

Reg. 48555

Patent attorney

Mann Patent Consulting

Alameda, CA · 94501

650-269-4468

Ramasamy M Mannan

Reg. 53266

Patent attorney

Magna Carta LLC

Walnut Creek, CA · 94597

203-605-1976

Alana C. Mannige

Reg. 71899

Patent attorney

Twilio Inc.

San Francisco, CA · 94105

415-390-2337

Amy S Manning

Reg. 56567

Patent attorney

Amy Manning

Belvedere, CA · 94920

415-627-8260

Eileen A Manning-Villar

Reg. 48993

Patent attorney

Eileen Manning-Villar, Attorney at Law

Pacifica, CA · 94044

650-784-6382

Johnny F R Manriquez

Reg. 51142

Patent attorney

Del Mar, CA · 92014

619-246-3033

Rick L. Mansel

Reg. 72849

Patent attorney

Lake Forest, CA · 92630

949-444-3727

Jonathan T Manson

Reg. 43774

Patent attorney

Google, Inc.

Mountain View, CA · 94043

650-623-4000

Danny M. Mansour

Reg. 68345

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626

714-830-0600

Thomas B Manuel

Reg. 56227

Patent attorney

Half Moon Bay, CA · 94019

650-833-9816

Daniel Huaizhou Mao

Reg. 51995

Patent agent

Faegre Drinker Biddle & Reath LLP

San Francisco, CA · 94111

415-591-7571

Edward S Mao

Reg. 40713

Patent attorney

Silicon Valley Patent Group

Santa Clara, CA · 95054

408-857-0559

Helen Z Mao

Reg. 61355

Patent agent

San Jose, CA · 95129

408-802-4098

Hsiang-Kuen Mao

Reg. 51996

Patent agent

Elk Grove, CA · 95758

916-686-0878

Stephen A Mao

Reg. 73418

Patent attorney

Kilpatrick Townsend and Stockton

Menlo Park, CA · 94025

650-326-2400

Yifan Mao

Reg. 60804

Patent attorney

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-324-6311

Andrew N Mar

Reg. 59698

Patent attorney

Procopio, Cory, Hargreaves & Savitch LLP

San Diego, CA · 92101

619-906-5624

Julie Y Mar-Spinola

Reg. 33533

Patent attorney

Finjan Holdings LLC

Redwood City, CA · 94063

650-526-8208

Nora A Marachelian

Reg. 68087

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-721-6316

Andre L Marais

Reg. 48095

Patent attorney

Schwegman, Lundberg & Woessner, P.A.

San Jose, CA · 95113

408-278-4040

Constantine Marantidis

Reg. 39759

Patent attorney

Christie, Parker & Hale, LLP

Glendale, CA · 91205

626-795-9900

Mark Joseph Marcelli

Reg. 36593

Patent attorney

Del Mar, CA · 92014

619-677-5747

Michael A. Marcelli

Reg. 56976

Patent attorney

Marcelli Law Office, A Professional Law Corporation

Simi Valley, CA · 93065

805-527-7875

Christopher S. Marchese

Reg. 37177

Patent attorney

Fish & Richardson, P.C.

San Diego, CA · 92130-2081

858-678-5070

Brian I Marcus

Reg. 34511

Patent attorney

Vierra Magen Marcus LLP

San Francisco, CA · 94105

415-489-4100

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.