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 Amgen Inc., Fitch, Even, Tabin & Flannery, LLP, and Invitae.

Top cities in California

All practitioners in California

Steven M Freeland

Reg. 42555

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

San Diego, CA · 92121

858-552-1311

Corrine M Freeman

Reg. 37625

Patent attorney

Irvine, CA · 92612-3723

949-854-8320

Simona Freeman

Reg. 63901

Patent attorney

Invitae

San Francisco, CA · 94103

408-315-9158

Elizabeth S. Freeman Rosenzweig

Reg. 80277

Patent attorney

Switch Bioworks, Inc.

San Carlos, CA · 94070

408-357-0263

James M Frei

Reg. 71458

Patent agent

Dentons US LLP

San Francisco, CA · 94105

415-882-0108

Thomas M Freiburger

Reg. 27063

Patent attorney

Tiburon, CA · 94920

415-435-0240

Arthur Freilich

Reg. 19281

Patent attorney

Freilich, Hornbaker & Rosen

Chatsworth, CA · 91311

818-678-6408

Kathryn V Freistadt

Reg. 41763

Patent attorney

Law Offices of Kathryn V. Freistadt

Berkeley, CA · 94709

510-526-6065

Raphael Freiwirth

Reg. 52918

Patent agent

Qualcomm

San Diego, CA · 92121-1714

858-651-0777

Steven James French

Reg. 78743

Patent attorney

Lewis Roca Rothgerger Christie

Glendale, CA · 91203

626-683-4585

Richard G Frenkel

Reg. 47578

Patent attorney

Latham & Watkins LLP

Menlo Park, CA · 94025

650-328-4600

Derek P Freyberg

Reg. 29250

Patent attorney

Menlo Park, CA · 94025-2932

650-321-7971

John S Friderichs

Reg. 31512

Patent attorney

San Diego, CA · 92117

858-276-2854926

Ryan J Friedl

Reg. 56357

Patent attorney

Defense Microelectronics Activity

McClellan, CA · 95652

916-999-2658

Bradford L Friedman

Reg. 41764

Patent attorney

Intellectual Property Law & Business Practice

Mountain View, CA · 94041

408-832-0981

Eric M Friedman

Reg. 65958

Patent agent

Walnut Creek, CA · 94598

510-219-0162

Serah Ruth Friedman

Reg. 79146

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

310-407-3469

Susan L. Friedman

Reg. 68079

Patent attorney

Friedman IP

San Diego, CA · 92018

619-837-3344

Bernard P Friedrichsen

Reg. 44689

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

805-447-0628

Shlomo R Frieman

Reg. 26889

Patent attorney

Los Angeles, CA · 90036

323-857-1390

Gary N Frischling

Reg. 35515

Patent attorney

ORRICK, HERRINGTON & SUTCLIFFE LLP

IRVINE, CA · 92614

310-633-2841

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

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.