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 Wilson Sonsini Goodrich & Rosati, Farella Braun + Martel, LLP, and Workday, Inc..

Top cities in California

All practitioners in California

Ty W. Callahan

Reg. 76294

Patent attorney

Wilson Sonsini Goodrich & Rosati

Los Angeles, CA · 90071

323-210-2934

Edward William Callan

Reg. 24720

Patent attorney

San Diego, CA · 92130

858-259-5533

Daniel C. Callaway

Reg. 74267

Patent attorney

Farella Braun + Martel, LLP

San Francisco, CA · 94104

415-954-4924

Timothy J. Calloway

Reg. 83204

Patent attorney

Workday, Inc.

Pleasanton, CA · 94588

925-951-9000

Melanie A Calvert

Reg. 31595

Patent attorney

Law Office of Melanie Calvert

Altadena, CA · 91001

626-497-4543

Andrew J Cameron

Reg. 50281

Patent attorney

NIWC PACIFIC CODE 36000

San Diego, CA · 92152

619-553-3001

Kimberly K Cameron

Reg. 58477

Patent agent

ESI

Sunnyvale, CA · 94086

650-468-8000

Robert E Camors· Jr.

Reg. 62405

Patent attorney

Law Office of Bob Camors

SAN JOSE, CA · 95126

408-391-4099

Cathryn Campbell

Reg. 31815

Patent attorney

Rancho Santa Fe, CA · 92067

619-994-2056

Jack Foy Campbell

Reg. 50935

Patent agent

Jack Foy Campbell

Santa Monica, CA · 90405

310-392-1329

Louis L Campbell

Reg. 59963

Patent attorney

Orbit IP

Los Angeles, CA · 90064

310-887-1333

Lowell L Campbell

Reg. 48889

Patent agent

Ameh IP

Carlsbad, CA · 92013-1654

760-804-1757

Mary E H Campbell

Reg. 71850

Patent agent

California Institute of Technology

Pasadena, CA · 91125

626-818-1316

Patricia A Campbell

Reg. 67116

Patent attorney

Jones Day

Palo Alto, CA · 94303

650-687-4138

Richard E Campbell

Reg. 34790

Patent attorney

Procopio Cory Hargreaves & Savitch, LLP

San Diego, CA · 92101

619-515-3289

William J Campbell

Reg. 73953

Patent attorney

William J. Campbell, Esq.

Oceanside, CA · 92056

805-501-3104

Donna M Campisi

Reg. 48824

Patent agent

San Francisco, CA · 94122

Elizabeth Agcaoili Campos

Reg. 50662

Patent attorney

Ontario, CA · 91762

858-255-1622

Jorge Campos

Reg. 62872

Patent agent

Mountain View, CA · 94040

408-402-8157

Michael Campos

Reg. 74159

Patent agent

La Jolla, CA · 92037

213-840-1428

Michael D Camras

Reg. 45440

Patent agent

Philips Lumileds Lighting Company

San Jose, CA · 95131

408-964-2528

Nathan B. Camuti

Reg. 71068

Patent attorney

Camuti Law Group APC

Irvine, CA · 92614

949-716-5565

Karen Canaan

Reg. 42382

Patent attorney

CanaanLaw, P.C.

Los Gatos, CA · 95030

650-279-4976

Donald W Canady

Reg. 18555

Patent attorney

Vista, CA · 92084

760-941-3277

Karen S Canady

Reg. 39927

Patent attorney

canady + lortz LLP

Los Angeles, CA · 90010

310-966-9400

Kyle R. Canavera

Reg. 72167

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130

858-720-5782

Carlos M Candeloro

Reg. 52691

Patent attorney

Carlos M. Candeloro, Esq.

Manhattan Beach, CA · 90266

310-994-4259

Anthony J. Canning

Reg. 62107

Patent agent

Arent Fox LLP

San Fransico, CA · 94105

415-805-7942

Francis X Canning

Reg. 50264

Patent agent

Mammoth Lakes, CA · 93546

304-290-5402

Alan W Cannon

Reg. 34977

Patent attorney

Law Office Of Alan W Cannon

Campbell, CA · 95008

408-736-3554

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.