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., Fritz Law Group, and Fish & Richardson P.C..

Top cities in California

All practitioners in California

Paula S Fritsch

Reg. 58095

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

805-447-9350

Jack Fritz

Reg. 73643

Patent attorney

Fritz Law Group

Pasadena, CA · 91103

626-629-8845

Walt Froloff

Reg. 52923

Patent attorney

Aptos, CA · 95003

831-662-0505

Kathleen Anne Frost

Reg. 37326

Patent attorney

Larkspur, CA · 94977

415-936-9731

Martin Fruitman

Reg. 26890

Patent attorney

Valencia, CA · 91355

661-254-4928

John-Paul R. Fryckman

Reg. 62880

Patent attorney

Fish & Richardson P.C.

San Diego, CA · 92130

858-678-4396

Chong Fu

Reg. 55193

Patent agent

Union City, CA · 94587

510-324-4978

Diana Y Fu

Reg. 52924

Patent attorney

Van Pelt, Yi & James LLP

Cupertino, CA · 95014

408-973-2593

Yuan-Te Fu

Reg. 75627

Patent agent

Cupertino, CA · 95014

408-334-1478

Michael A Fuerch

Reg. 68153

Patent attorney

Adeia, Inc.

San Jose, CA · 10595

408-473-2500

Harold T Fujii

Reg. 38458

Patent attorney

Sony Corporation of America

San Jose, CA · 95112

408-352-4540

Sharon M Fujita

Reg. 38459

Patent attorney

Cytomx Therapeutics, Inc.

South San Francisco, CA · 94080

650-825-5320

Lori K Fujitake

Reg. 46712

Patent agent

Fujitake Law Offices

Santa Clara, CA · 95105

408-732-7021

Tomohisa Fujiwara

Reg. 80143

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4210

Sandra S Fujiyama

Reg. 46713

Patent attorney

Wilson Sonsini Goodrich & Rosati, P.C.

Los Angeles, CA · 90071

323-210-2903

Juri Yasuko Fukuda

Reg. 63091

Patent agent

Piedmont, CA · 94611

510-655-7519

Anthony T Fulcher

Reg. 50284

Patent attorney

Santa Clara Valley Water District

San Jose, CA · 95118

408-265-2600

Alyson C Fuller

Reg. 61844

Patent agent

Prolacta Bioscience

City of Industry, CA · 91746

773-351-0337

John R Fuller

Reg. 80851

Patent agent

Palo Alto, CA · 94304

650-838-4405

Mary A Fuller

Reg. 45480

Patent attorney

Lincoln Law School of San Jose

San Jose, CA · 95113

650-654-3400

Michael L Fuller

Reg. 36516

Patent attorney

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

858-707-4000

Renee C. Fuller

Reg. 73220

Patent attorney

Bristol Myers Squibb

Brisbane, CA · 94005

650-420-6254

Susan B Fuller

Reg. 51979

Patent agent

Poway, CA · 92064

858-229-2400

Thomas J. Fuller

Reg. 74439

Patent attorney

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-324-6357

Daniel C. Fullerton

Reg. 69773

Patent attorney

La Crescenta, CA · 91214

303-548-6449

Christine A Fung

Reg. 36141

Patent agent

Rancho Palos Verdes, CA · 90274

310-524-9113

Hei T Fung

Reg. 71291

Patent agent

Fremont, CA · 94538

408-838-2757

Foojan Funk

Reg. 62221

Patent agent

San Rafael, CA · 94903

415-299-9656

Robert E Furlani

Reg. 76492

Patent attorney

Ligand Pharmaceuticals Incorporated

San Diego, CA · 92121

716-359-6354

Eric S Furman

Reg. 45664

Patent attorney

Knobbe, Marten, Olson & Bear, LLP

Irvine, CA · 95401

979-760-0404

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.