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 & Bear, LLP, Morrison & Foerster LLP, and Womble Bond Dickinson (US) LLP.

Top cities in California

All practitioners in California

Al A Canzoneri

Reg. 30246

Patent agent

Whittier, CA · 90604

562-943-4924

Yuchen Z. Cao

Reg. 73383

Patent agent

Morrison & Foerster LLP

San Diego, CA · 92130-2040

858-720-7945

Zhan John Cao

Reg. L1167

Limited recognition

Womble Bond Dickinson (US) LLP

Sunnyvale, CA · 94085

408-341-3033

Susan A Capello

Reg. 34560

Patent attorney

Intel Corporation

Santa Clara, CA · 95054

Dawn M Capp

Reg. 54018

Patent attorney

The Bones Law Firm

Fair Oaks, CA · 95628

916-965-6647

Anne M Cappella

Reg. 43217

Patent attorney

Weil Gotshal and Manges, LLP

Redwood Shores, CA · 94065

650-802-3141

Charles B Cappellari

Reg. 40937

Patent attorney

Gen-Probe, Inc.

San Diego, CA · 92121

858-410-8927

Paige L. Cappelli

Reg. 79142

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

202-640-6409

Didier Capre

Reg. 84333

Patent agent

Envista

Brea, CA · 92821

657-478-6241

Jacque Carmen Caprio

Reg. 75962

Patent agent

10x Genomics

Pleasanton, CA · 94588-3260

865-643-3044

Aaron J Capron

Reg. 56170

Patent attorney

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304-1203

650-849-6680

Gabrielle A. Capulong

Reg. 83642

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

212-849-3077

Marie Grace G Capuyan

Reg. 52695

Patent attorney

Sacramento Municipal Utilities District

Sacramento, CA · 95817

916-732-5670

Heber M Carbajal-Chavez

Reg. 80878

Patent attorney

Naval Postgraduate School

Monterey, CA · 93943

303-514-7335

Hannah Dvorak Carbone

Reg. 62614

Patent agent

California Institute of Technology

Pasadena, CA · 91125

626-395-2381

Erin M. Cardinal

Reg. 79744

Patent attorney

KNOBBE MARTENS OLSON AND BEAR LLP

Irvine, CA · 92614

202-640-6417

Douglas A Cardwell

Reg. 36472

Patent attorney

Palo Alto, CA · 94301

650-269-5818

John C Carey

Reg. 51530

Patent attorney

Artegis Law Group, LLP

Sunnyvale, CA · 94085

407-715-1213

Alyssa M. Caridis

Reg. 57545

Patent attorney

Orrick Herrington & Sutcliffe LLP

Los Angeles, CA · 90071

213-612-2372

Frank S Carleo

Reg. 42388

Patent agent

Alhambra, CA · 91801

626-280-0582

Mark J Carlozzi

Reg. 39621

Patent attorney

Lake Forest, CA · 92630

949-673-5375

Arthur J Carlson

Reg. 50625

Patent agent

Nevada City, CA · 95959

530-265-0817

Erik J. Carlson

Reg. 61877

Patent attorney

Alston & Bird LLP

Los Angeles, CA · 90071

213-576-1000

Joanne Carlson

Reg. 54433

Patent attorney

Los Gatos, CA · 95030

408-378-8080

Kurt W Carlson

Reg. 46601

Patent attorney

Sonitus Medical Inc,

San Mateo, CA · 94402

650-353-5836

Steven C Carlson

Reg. 48632

Patent attorney

Robins Kaplan LLP

Berkeley, CA · 94704

650-784-4040

Katy M Carlyle

Reg. 78204

Patent attorney

U.S. District Court

Santa Ana, CA · 92701

858-531-2188

Thomas T. Carmack

Reg. 57645

Patent attorney

Arnold & Porter, LLP

Palo Alto, CA · 94304-1216

650-798-2968

Nevin S Carmichael

Reg. 44591

Patent attorney

Carmichael & Co.

Cupertino, CA · 95014

408-600-1203

Hayden Albert Carney

Reg. 22653

Patent attorney

la Canada, CA · 91011

818-790-6020

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.