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 Morrison & Foerster LLP, Palumbo Bergstrom, LLP, and Toyon Research Corporation.

Top cities in California

All practitioners in California

Clinton W. Ewell

Reg. 81759

Patent attorney

Morrison & Foerster LLP

San Francisco, CA · 94105

415-268-7000

Jacob P. Ewerdt

Reg. 75557

Patent attorney

Morrison & Foerster LLP

San Francisco, CA · 94105

415-268-7000

Ely Rose Exner

Reg. 58007

Patent attorney

Palumbo Bergstrom, LLP

Irvine, CA · 92614

Kenan O Ezal

Reg. 55162

Patent attorney

Toyon Research Corporation

Goleta, CA · 93117-3021

805-968-6787

Cynthia Thomas Faatz

Reg. 39973

Patent attorney

Nicholson De Vos Webster & Elliott LLP

San Jose, CA · 95113

408-684-6374

Donna M Fabian

Reg. 64671

Patent attorney

San Jose, CA · 95110

408-396-8967

Gary Robert Fabian

Reg. 33875

Patent agent

FarSight Patent Services

Redwood City, CA · 94061

650-780-9030

Michael D Fabiano

Reg. 44675

Patent attorney

Fabiano Law Firm, P.C.

San Diego, CA · 92130

619-742-9631

Kent A Fagan

Reg. 64288

Patent attorney

Exelixis

Alameda, CA · 94502

513-993-8139

Matthew Christopher Fagan

Reg. 37542

Patent attorney

Intel Corporation

Pleasanton, CA · 94566-5784

408-765-4056

Scot S Fagerland

Reg. 56532

Patent attorney

Law Office of Scot S. Fagerland

Los Angeles, CA · 90064

310-499-3285

Hamid Fahimi

Reg. 68536

Patent agent

McDermott Will and Emery

Menlo Park, CA · 94025

650-279-5801

Tarek N Fahmi

Reg. 41402

Patent attorney

Ascenda Law Group, PC

San Jose, CA · 95131

866-877-4883

Dennis M Faigal

Reg. 72815

Patent attorney

San Jose, CA · 95136

626-818-7189

Bryan M Failing

Reg. 57974

Patent attorney

Cortex Law Group, P.C.

Morgan Hill, CA · 95038

408-680-2500

Heidi H Faivre

Reg. 55165

Patent agent

Little River, CA · 95456

831-588-4548

Javier Fajardo· Jr

Reg. 83162

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

650-335-4922

Katherine M Falkenhagen

Reg. 70475

Patent agent

Norton Rose Fulbright US LLP

Los Angeles, CA · 90071

213-892-9200

Martin C Fallon

Reg. 47554

Patent agent

Chevron CORP

San Ramon, CA · 94583

925-973-4665

Calvin A Fan

Reg. 38444

Patent attorney

San Diego, CA · 92107

619-846-1492

Heather H Fan

Reg. 51664

Patent attorney

Rhodes LLP

Los Angeles, CA · 90071

213-293-3292

Jason C Fan

Reg. 54092

Patent attorney

Los Altos, CA · 94024

650-938-3483

Tao Fan

Reg. 78811

Patent agent

Fremont, CA · 94536

650-245-3174

Wenhong Fan

Reg. 56899

Patent agent

Cupertino, CA · 95014

650--46-4-1416

Alex C Fang

Reg. 67124

Patent attorney

Oakland, CA · 94611

510-717-1541

Carol A Fang

Reg. 48631

Patent attorney

Genentech

South San Francisco, CA · 94080-4990

650-467-2901

Pengshu Fang

Reg. 84046

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

619-742-8962

Ralf Fang

Reg. 65431

Patent agent

Structure Therapeutics Inc.

South San Francisco, CA · 94080

650-714-3161

Ronald L. Fantroy· Jr.

Reg. 74957

Patent attorney

San Francisco, CA · 94109

205-908-2817

Farshad Jason Far-Hadian

Reg. 42523

Patent attorney

Mintz Levin

San Diego, CA · 92130

858-314-2144

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.