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 IBM Almaden Research Center, Hartmans Law, and Orrick Herrington & Sutcliffe LLP.

Top cities in California

All practitioners in California

Ingrid M Foerster

Reg. 36511

Patent attorney

IBM Almaden Research Center

San Jose, CA · 95120-6099

408-927-3389

Joel M Fogelson

Reg. 43613

Patent attorney

Hartmans Law

Manhattan Beach, CA · 90266

732-735-5559

Ernest D Fok

Reg. 79987

Patent attorney

Orrick Herrington & Sutcliffe LLP

Santa Monica, CA · 90401

310-633-2825

Joseph P Foley

Reg. 45757

Patent attorney

Chevron Texaco, Corp.

San Ramon, CA · 94583

925-842-1564

Cameron P Folmar

Reg. 75889

Patent attorney

The Law Office of Cameron P Folmar

Irvine, CA · 92603

949-232-3993

Brent A Folsom

Reg. 43614

Patent attorney

Haynes and Boone, LLP

Costa Mesa, CA · 92626

949-202-3013

Krisztina Foltenyi

Reg. 71197

Patent agent

National City, CA · 91950

442-888-4313

Aaron C Fong

Reg. 61923

Patent attorney

Honda Patents & Technologies NA LLC

Torrance, CA · 90501

Eric L. Fong

Reg. 66886

Patent attorney

Lafayette, CA · 94549

678-223-3664

Gary L Fong

Reg. 70633

Patent agent

Cupertino, CA · 95014

415-890-5248

Jerry Fong

Reg. 42544

Patent agent

San Pedro, CA · 90734

626-673-4084

Vivian J. Fong

Reg. 71628

Patent attorney

Kirkland & Ellis LLP

Los Angeles, CA · 90071

213-680-8363

Wendy M. Fong

Reg. 81644

Patent agent

Palo Alto, CA · 94304

165-081-36498

Wei Cho Foo

Reg. 72584

Patent agent

Palo Alto, CA · 94303

650-906-0558

Katherine C. Forbes

Reg. 84230

Patent agent

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94105

415-531-9528

Walker R Force

Reg. 56354

Patent agent

San Diego, CA · 92127

858-692-2076

Clifford E Ford

Reg. 52903

Patent attorney

Isis Pharmaceuticals, Inc.

Carlsbad, CA · 92010

760-603-2784

Joseph Sampson Ford· Jr.

Reg. 60880

Patent attorney

Ford & Associates

Santa Monica, CA · 90403

310-614-3647

Simon S Ford

Reg. 57863

Patent attorney

Dexcom, Inc.

San Diego, CA · 92121

888-738-3646

Jean Burke Fordis

Reg. 32984

Patent attorney

Los Altos, CA · 94022

650-949-2244

Jeremy S Forest

Reg. 62827

Patent agent

Biosynthetic Technologies

Irvine, CA · 92614

650-387-8492

M. Grace Forker

Reg. 54133

Patent agent

LinkedIn Corporation

Sunnyvale, CA · 94085

650-426-6742

Michael S Forman

Reg. 57864

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

202-640-6422

Kevin J Forrestal

Reg. 45861

Patent agent

Allergan, Inc.

Irvine, CA · 92612

714-246-2559

Amelia S. Forsberg

Reg. 69367

Patent attorney

KOKKA & BACKUS, PC

Palo Alto, CA · 94306

650-566-9917

Robert J Forsell· Jr

Reg. 51693

Patent agent

Irvine, CA · 92602

714-788-9675

Sarah M Forsse

Reg. 52596

Patent agent

McNeill PLLC

San Diego, CA · 92108

831-316-7539

Ian J. Forsythe

Reg. 84647

Patent agent

Fountain Valley, CA · 92708

607-229-8097

David M. Fortner

Reg. 60247

Patent attorney

San Diego, CA · 92126

858-653-3662

Andrew D Fortney

Reg. 34600

Patent attorney

Central California IP Group, P.C

Fresno, CA · 93711

559-840-0841

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.