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 Sonitus Medical Inc,, Robins Kaplan LLP, and U.S. District Court.

Top cities in California

All practitioners in California

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

Jeremy J. Carney

Reg. 75717

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

JoJo C. Caro

Reg. 74954

Patent attorney

Lancaster, CA · 93535

310-330-6386

Claude J Caroli

Reg. 28831

Patent attorney

Chevron Corporation

Richmond, CA · 94802

510-242-1588

R'Sue Popowich Caron

Reg. 52699

Patent agent

Caron IP

Berkeley, CA · 94705

510-214-6260

Jo Dale Carothers

Reg. 74180

Patent attorney

Weintraub Tobin

San Diego, CA · 92130

858-436-8152

Ross M Carothers

Reg. 44593

Patent agent

SpineView, Inc.

Fremont, CA · 95125

650-208-0986

W Douglas Carothers· Jr

Reg. 22024

Patent attorney

Cupertino, CA · 95014

408-466-0988

David A Carpenter

Reg. 45945

Patent attorney

BeiGene LTD

San Mateo, CA · 94403

628-239-0985

John D Carpenter

Reg. 34133

Patent attorney

The Law Office John D. Carpenter

Pasadena, CA · 91101

626-432-7275

John W Carpenter

Reg. 39129

Patent attorney

Dolby Laboratories Inc.

San Francisco, CA · 94103

415-645-5648

Eric R. Carr

Reg. 70423

Patent attorney

Bunsow De Mory LLP

Redwood City, CA · 94063

858-901-0230

Rodger K Carreyn

Reg. 50774

Patent attorney

Perkins Coie LLP

Los Angeles, CA · 90067-1721

310-788-3225

M. Robyn Carrillo

Reg. 47474

Patent attorney

Northridge, CA · 91324

Ann Kim Berridge Carroll

Reg. 54999

Patent agent

Department of Water Resources

Sacramento, CA · 95814

916-820-7791

David C Carroll

Reg. 62748

Patent agent

San Francisco, CA · 94116

Peter G Carroll

Reg. 32837

Patent attorney

Medlen & Carroll, LLP

Oakland, CA · 94612

781-848-4020

Terrence J. Carroll

Reg. 60653

Patent attorney

Micro Focus

Santa Clara, CA · 95054

877-686-9637

Tracie Lyn Carroll

Reg. 59619

Patent attorney

La Jolla Pharmaceutical Company

San Diego, CA · 92121

760-954-1942

Gregory Donald Carson

Reg. 77847

Patent attorney

Carson Patents

Rancho Cucamonga, CA · 91730

888-483-1141

John M Carson

Reg. 34303

Patent attorney

Knobbe, Martens, Olson & Bear LLP

San Diego, CA · 92130

858-707-4000

Merl John Carson· III

Reg. 25090

Patent attorney

Nortonrosefulbright

Los Angeles, CA · 90071

213-892-9312

Douglas H Carsten

Reg. 43534

Patent attorney

McDermott Will & Emery

Irvine, CA · 92612-2565

949-620-6111

David S. Carter

Reg. 67619

Patent agent

Sunnyvale, CA · 94087

650-269-1641

Mark R Carter

Reg. 39131

Patent attorney

San Francisco, CA · 94164-1412

415-295-4524

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.