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 Cypress Semiconductor Corporation, Knobbe Martens Olson & Bear, LLP, and Arent Fox LLP.

Top cities in California

All practitioners in California

Timothy R Croll

Reg. 36771

Patent attorney

Cypress Semiconductor Corporation

San Jose, CA · 95134-1709

408-545-6942

Scott A Cromar

Reg. 65066

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-721-2812

Chester E Crone

Reg. 41691

Patent attorney

Woodland Hills, CA · 91367

818-710-8521

Cornell D Crosby

Reg. 67168

Patent attorney

Arent Fox LLP

Los Angeles, CA · 90013

213-988-6696

Arnold W Cross

Reg. 74154

Patent agent

Patent Agent Arnold Cross

Buena Park, CA · 90621

714-736-0749

Justin H Cross

Reg. 66911

Patent attorney

Verenium Corporation

San Diego, CA · 92121

858-431-8595

Albert Milton Crowder· Jr

Reg. 28063

Patent attorney

Office Of A. M. Crowder

Petaluma, CA · 94954-5624

503-729-0024

Robert G Crownover

Reg. 63139

Patent attorney

Law Offices of Robert Crownover

Sunnyvale, CA · 94086-0272

650-430-4542

John F. Cruikshank· III

Reg. 60842

Patent attorney

Cruikshank and Cruikshank

Sausalito, CA · 94965

415-990-5783

Joseph R. Cruse· Jr.

Reg. 51591

Patent attorney

Attorney at Law

Palm Springs, CA · 92262

310-598-3811

Richard P Cruz

Reg. 67384

Patent agent

Los Angeles, CA · 90017

909-680-2505

Bernard C. Cryan

Reg. 79833

Patent attorney

Fish & Richardson, P.C.

San Diego, CA · 92130

858-678-4772

Andrew B Cubitt

Reg. 45452

Patent agent

San Diego, CA · 92131

858-530-0718

Clarissa A. Cuevas

Reg. 82076

Patent agent

El Segundo, CA · 90245

310-571-8208

Jie Cui

Reg. 79389

Patent attorney

Santa Clara, CA · 95050

650-224-7174

Yuqing Cui

Reg. 78742

Patent attorney

Morrison & Foerster LLP

San Franciso, CA · 94105

415-268-7344

Justin E Culbertson

Reg. 77014

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

202-640-6400

Crystal Leah Culhane

Reg. 67317

Patent attorney

Fish & Richardson

San Diego, CA · 92130

858-678-5635

Louis C Cullman

Reg. 39645

Patent attorney

K&L Gates LLP

Irvine, CA · 92614

949-253-0900

Freeman D Cullom

Reg. 62823

Patent attorney

San Francisco, CA · 94115

415-441-2253

Guy L Cumberbatch

Reg. 36114

Patent attorney

Patent 4 You, Inc.

Santa Barbara, CA · 93109

805-259-5425

Jefferson E. Cummings

Reg. 81926

Patent attorney

Los Angeles, CA · 90025

310-826-7474

Don Le Quy Cung

Reg. 65678

Patent agent

Palo Alto, CA · 94303

650-856-7735

Kelly W Cunningham

Reg. 43570

Patent attorney

Ervin Cohen & Jessup LLP

Beverly Hills, CA · 90212

310-281-6339

James E Curry

Reg. 40974

Patent attorney

The Law Offices of James E. Curry

La Crescenta, CA · 91224

818-542-4082

Michael J Curry

Reg. 69242

Patent attorney

LEWIS ROCA ROTHGERBER CHRISTIE LLP

Glendale, CA · 91209

626-795-9900

Craig H Curtis

Reg. 58470

Patent agent

El Cajon, CA · 92020

619-634-7417

David James Cushing

Reg. 28703

Patent attorney

David Cushing

Santa Barbara, CA · 93103

240-413-0235

Cameron A Cushman

Reg. 69243

Patent attorney

Silver Lake, CA · 90026

602-820-8115

Milton Frederick Custer

Reg. 29787

Patent agent

Hexcel Corporation

Roseville, CA · 95747

916-771-7044

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.