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 Knobbe Martens Olson and Bear, LLP, Leclairryan LLP, and Dickenstein Shapiro, LLC.

Top cities in California

All practitioners in California

William D Janicki

Reg. 70542

Patent attorney

Leclairryan LLP

Sacramento, CA · 94104

916-346-8736

David G Jankowski

Reg. 43691

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Eric Barry Janofsky

Reg. 30759

Patent attorney

RANCHO MISSION VIEJO, CA · 92694

917-720-6492

Ilene Lapidus Janofsky

Reg. 30950

Patent attorney

Sunnyvale, CA · 94085

408-548-0003

Allan William Jansen

Reg. 29395

Patent attorney

Dickenstein Shapiro, LLC

Irvine, CA · 92614

Rebecca A. Jansen

Reg. 76732

Patent agent

Fitch Even

San Luis Obispo, CA · 93401

805-548-1805

Jason J. Jardine

Reg. 61805

Patent attorney

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

858-707-4000

Jessica L. Jarecki

Reg. 73669

Patent agent

IGM Biosciences, INC.

Mountain View, CA · 94043

650-542-7030

Catherine Grace Jarett

Reg. 37360

Patent attorney

Law Offices of Catherine Jarett

Walnut Creek, CA · 94597

925-878-9397

Jackson L Jaro

Reg. 78078

Patent agent

Santa Rosa, CA · 95409

612-638-7376

Richard Allen Jarrett

Reg. 51134

Patent agent

Ramona, CA · 92065

760-788-6785

Marjorie L Jarvis

Reg. 39238

Patent agent

Thermo Fisher Scientific

Carlsbad, CA · 92008

858-268-8410

Yemmanur Jayachandra

Reg. 27139

Patent agent

Sunnyvale, CA · 94087

408-737-9762

Alireza Jazayeri

Reg. 68663

Patent agent

Twitter, Inc.

San Francisco, CA · 94103

415-222-9670

Troy A Jefferson· Jr.

Reg. 76655

Patent agent

Oakland, CA · 94607

843-437-4538

Russell M Jeide

Reg. 54198

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Madison Cunningham Jellins

Reg. 35555

Patent attorney

Coherus BioSciences, Inc.

Redwood City, CA · 94065

650-395-0182

George C Jen

Reg. 39239

Patent attorney

Piedmont, CA · 94618

510-761-5451

Kenyon S Jenckes

Reg. 41873

Patent agent

San Diego, CA · 92101

619-535-0083

David Stuart Taylor Jenkins

Reg. 35206

Patent attorney

Law Office of David S.T. Jenkins

Sunnyvale, CA · 94086

408-241-5436

Kenneth E Jenkins

Reg. 51846

Patent attorney

Mintz, Levin, Cohn, Ferris, Glovksy and Papeo, P.C.

San Diego, CA · 92130

858-314-1082

Randi L Jenkins

Reg. 50297

Patent agent

Sacramento, CA · 95835

Joseph F Jennings

Reg. 40664

Patent attorney

Knobbe Marten Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Romeao J Jennings· III

Reg. 65808

Patent agent

Akin Gump Strauss Hauer & Feld LLP

Irvine, CA · 92614

949-885-4100

Kenneth Jenq

Reg. 75336

Patent attorney

San Francisco, CA · 94127

310-422-8679

Jonathan J Jensen

Reg. 59433

Patent agent

Salk Institute for Biological Studies

La Jolla, CA · 92037

617-818-0716

Philip D Jensen

Reg. 63563

Patent agent

Polsinelli

San Francisco, CA · 94111

415-248-2114

Stephen Chris Jensen

Reg. 35556

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Travis M. Jensen

Reg. 60087

Patent attorney

Orrick, Herrington & Sutcliffle LLP

Menlo Park, CA · 94025-1015

650-614-7458

Peter C. Jensen-Haxel

Reg. 71039

Patent attorney

Menlo Park, CA · 94025

541-301-4960

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.