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 Gates and Cooper, LLP, ESPLIN & ASSOCIATES, PC, and Knobbe Martens.

Top cities in California

All practitioners in California

Victor G Cooper

Reg. 39641

Patent attorney

Gates and Cooper, LLP

Hermosa Beach, CA · 90254

310-641-8797

Nicole D. Cooper-Gray

Reg. 81847

Patent agent

los angeles, CA · 91601

312-450-4586

Thomas Morgan Cope· Jr

Reg. 68201

Patent agent

ESPLIN & ASSOCIATES, PC

SAN MARCOS, CA · 92078

760-228-4325

Adam G Copeland

Reg. 83403

Patent attorney

Knobbe Martens

San Diego, CA · 92130

858-707-4270

Robert D. Copeland

Reg. 58742

Patent attorney

The Boeing Company

Huntington Beach, CA · 92647

714-290-4831

Christopher M Corbet

Reg. 78698

Patent attorney

Fenwick & West, LLP

Mountain View, CA · 94041

650-335-7112

Brett M. Corbett

Reg. 84061

Patent attorney

CorePatents, L.P.

San Rafael, CA · 94903

503-803-3306

David A Cordeiro

Reg. 48134

Patent attorney

San Jose, CA · 95138

408-394-9476

Monique L Cordray

Reg. 34802

Patent attorney

Camarillo, CA · 91320

805-479-0762

Gregory S Cordrey

Reg. 44089

Patent attorney

Howrey, LLP

Irvine, CA · 92614

949-721-6900

Florin C Corie

Reg. 46244

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-658-3663

Sarah M. Cork

Reg. 83207

Patent attorney

Santa Monica, CA · 90403

919-824-9959

Colin D. Cormier

Reg. 83459

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

212-849-3049

Steven J Corr

Reg. 52427

Patent attorney

Jones Day Reavis and Pogue

Los Angeles, CA · 90013

213-243-2327

Hubertus M R Cortenraad

Reg. 77964

Patent agent

TDK-Invensense

San Jose, CA · 95110

408-493-9941

Roland B Cortes

Reg. 39152

Patent attorney

Santa Clara, CA · 95051

408-296-1670

Case Kyn Cortese

Reg. 62757

Patent agent

California Institute of Technology

Pasadena, CA · 91125

626-395-4942

Michael J. Cosley· III

Reg. 82953

Patent agent

Santa Monica, CA · 90405

805-705-3392

Ronald T Coslick· Jr

Reg. 36489

Patent attorney

Culver City, CA · 90232

310-280-9442

John P Costello

Reg. 36110

Patent attorney

Costello Law Corporation

Roseville, CA · 95661

916-441-2234

Michael Costello-Caulkins

Reg. 80346

Patent agent

San Carlos, CA · 94070

240-464-3553

Abigail M Cotton

Reg. 52773

Patent attorney

Bryan Cave Leighton Paisner LLP

San Francisco, CA · 94111-4070

415-675-3422

Stephen J. Cotton

Reg. 69494

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

510-663-1100

Andrew J. Coughlin

Reg. 83890

Patent attorney

Danville, CA · 94526

815-355-2041

Laurent M. F. Coulon

Reg. 72219

Patent agent

Glendale, CA · 91202

213-300-3253

Kathryn L Coulter

Reg. 45889

Patent attorney

San Mateo, CA · 94402

919-224-9000

Kendall E. Countess

Reg. 82315

Patent agent

Redondo Beach, CA · 90277

310-882-8489

John W Coursen

Reg. 46643

Patent attorney

Structural Composites Industries

Pomona, CA · 91768

909-444-2503

Barbara B Courtney

Reg. 42442

Patent attorney

Courtney IP Law

Los Gatos, CA · 95032

408-858-5174

Jordan Kathleen Coutts

Reg. 902902

Limited recognition

University of California, Los Angeles School of Law

Los Angeles, CA · 90095-1476

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.