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 The Walt Disney CO, Levine Bagade Han LLP, and Morrison and Foerster.

Top cities in California

All practitioners in California

Deborah J Acker

Reg. 48916

Patent attorney

Placerville, CA · 95667

650-521-9090

Joel G Ackerman

Reg. 24307

Patent attorney

Richmond, CA · 94805

510-236-6903

Steve W Ackerman

Reg. 31705

Patent attorney

The Walt Disney CO

Burbank, CA · 91521

818-560-1030

Nathan C. Ackermann

Reg. 84527

Patent agent

San Diego, CA · 92126

401-489-6355

Satoko Adachi

Reg. 62687

Patent agent

Torrance, CA · 90505

Joseph T Adamczyk

Reg. 76946

Patent attorney

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-414-5341

Anya P Adams

Reg. 77809

Patent attorney

Morrison and Foerster

Los Angeles, CA · 90017

808-345-2883

Brian S Adams

Reg. 63131

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-658-4351

Christopher C Adams

Reg. 58028

Patent agent

Invitrogen Corp.

Carlsbad, CA · 92008

760-603-7287

Michael J Adams

Reg. 80740

Patent agent

Squire Patton Boggs

San Francisco, CA · 94104

415-393-9887

Sharon J Adams

Reg. 39584

Patent attorney

Adams Law Firm

Berkeley, CA · 94704

510-649-1331

William O. Adams

Reg. 68306

Patent attorney

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Nabil A Adawi

Reg. 68179

Patent attorney

Roche

Pleasanton, CA · 94588

408-581-9784

Katherine N Addison

Reg. 57884

Patent attorney

Mckinleyville, CA · 95519

858-585-6120

Mani Adeli

Reg. 39585

Patent attorney

Adeli & Tollen, LLP

Los Angeles, CA · 90025

310-442-9300X301

Bonnie M Adell

Reg. 61387

Patent attorney

Zendesk, Inc.

San Francisco, CA · 94103

415-601-3416

Charles A Adelsheim

Reg. 63397

Patent attorney

Menlo Park, CA · 94025

206-321-5848

Michael T Adelsheim

Reg. 69399

Patent attorney

Tucker Ellis, LLP

San Francisco, CA · 94105

415-617-2246

Charles N Adelson

Reg. 79213

Patent agent

Cellanome, Inc.

Foster City, CA · 94404

650-542-9878

Amir V Adibi

Reg. 63443

Patent agent

Mountain View, CA · 94040

650-218-4483

Abhijit P Adisesh

Reg. 75261

Patent agent

Womble Bond Dickinson LLP

Palo Alto, CA · 94304

408-720-3492

Carolyn R Adler

Reg. 32324

Patent attorney

Micro Focus

Santa Clara, CA · 95054

650-258-2726

Micha Adler

Reg. 68422

Patent attorney

Procopio, Cory, Hargreaves & Savitch

Irvine, CA · 92618

949-346-8382

Dariush G Adli

Reg. 51386

Patent attorney

Adli Law Group P.C.

Los Angeles, CA · 90071

213-623-6546

Alison L Adnan

Reg. 63078

Patent agent

J. Mark Holland & Associates

Newport Beach, CA · 92660

949-718-6750

Sarah B. Adriano

Reg. 34470

Patent attorney

Adriano & Associates

Pasadena, CA · 91101

626-395-7801

Matthew Allan Adrianowycz

Reg. 79924

Patent agent

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94107

415-947-2142

Prem Advani

Reg. 52542

Patent agent

San Diego, CA · 92129

858-829-7688

Raj J Advani

Reg. 52543

Patent attorney

Wilson, Sonsini, Goodrich, and Rosati

San Diego, CA · 92130

858-350-2367

Samareh J. Afrasiabi

Reg. 79555

Patent attorney

One LLP

Newport Beach, CA · 92660

949-502-2870

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.