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 Law Office of John Christopher James, Van Pelt, Yi & James, LLP, and WSGR.

Top cities in California

All practitioners in California

Manzar Jalali

Reg. 46798

Patent attorney

Newport Beach, CA · 92658

949-230-5626

Parviz Jalali

Reg. 80073

Patent agent

Rancho Santa Fe, CA · 92067

619-890-8036

John C James

Reg. 40660

Patent attorney

Law Office of John Christopher James

Manhattan Beach, CA · 90266

310-283-8114

William J James

Reg. 40661

Patent attorney

Van Pelt, Yi & James, LLP

Cupertino, CA · 95014

408-973-2592

Tamim Jami

Reg. 74759

Patent agent

San Diego, CA · 92123

619-764-9459

Megan E Jamroz

Reg. 54196

Patent agent

WSGR

San Diego, CA · 92130

858-350-2300

Amir M. Jamshidi

Reg. 72847

Patent attorney

Block, Inc.

Oakland, CA · 94612

903-641-5599

Ashok Kumar Janah

Reg. 37487

Patent attorney

Janah & Associates, P.C.

San Francisco, CA · 94117-3814

415-538-1555

Clinton Jang

Reg. 65205

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

650-433-5800

Rae Eun Jang

Reg. 75630

Patent attorney

Samsung

San Jose, CA · 95134

408-544-4000

Soonhee Jang

Reg. 44802

Patent attorney

Danisco U.S. Inc.

Palo Alto, CA · 94303-1013

650-846-7620

Susan M Janicki

Reg. 80915

Patent attorney

Knobbe, Martens, Olson & Bear

Irvine, CA · 92614

946-760-0404

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

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.