California

Patent attorneys in California

California hosts 9,553 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 Morrison & Foerster LLP, Broadcom Limited, and Rivian Automotive.

Top cities in California

All practitioners in California

Mark L Blake

Reg. 75689

Patent attorney

Broadcom Limited

Irvine, CA · 92617

949-926-3467

Ronald B Blanchard

Reg. 28187

Patent agent

Mission Viejo, CA · 92691

949-770-5161

Bradley D Blanche

Reg. 38387

Patent attorney

Rivian Automotive

Irvine, CA · 92606

949-735-3306

Eve M. Bland

Reg. 81905

Patent agent

The J. David Gladstone Institutes

San Francisco, CA · 94158

415-734-2000

Eric S Blank

Reg. 68748

Patent attorney

Schwabe Williamson & Wyatt

Mountain View, CA · 94043

415-715-4519

Jennifer L Blanton

Reg. 74206

Patent attorney

San Diego, CA · 92128

703-969-0815

Justin E. Blanton

Reg. 58741

Patent attorney

Facebook

Menlo Park, CA · 94025

408-821-7840

Thomas L Blasdell

Reg. 31329

Patent attorney

Studio City, CA · 91604

818-524-9398

Meredith K. Blasingame

Reg. 74227

Patent attorney

NASA Ames Research Center

Moffett Field, CA · 94035

650-604-2062

Christopher M. Blatter

Reg. 69364

Patent attorney

Vopak Terminals

Wilmington, CA · 90744

310-549-0961

Richard L Blaylock

Reg. 43503

Patent attorney

Pillsbury Winthrop Shaw Pittman, LLP

San Diego, CA · 92130-2006

619-234-5000 EXT 4110

Matthew Jordan Blecher

Reg. 46558

Patent attorney

Wagner Blecher LLP

Aptos, CA · 95001

408-377-0500

Andrea S Blecken

Reg. 59290

Patent agent

MOUNTAIN VIEW, CA · 94041-1121

650-862-0585

Michael J Blessent

Reg. 76489

Patent agent

Bozicevic, Field, & Francis LLP

Redwood City, CA · 94065

650-327-3400

Piers A Blewett

Reg. 68464

Patent attorney

Schwegman Lundberg Woessner P.A.

San Jose, CA · 95128

404-538-9552

Stephanie L. Blij

Reg. 76129

Patent agent

Latham & Watkins LLP

Menlo Park, CA · 94025

650-470-4998

Christopher J. Blizzard

Reg. 70121

Patent agent

San Francisco, CA · 94116

484-467-4462

Alan Peter Block

Reg. 35450

Patent attorney

McKool Smith Hennigan, P.C.

Los Angeles, CA · 90071

213-694-1054

Leticia Reyes Block

Reg. 50167

Patent agent

Apple Inc.

Cupertino, CA · 95014

408-974-5875

Robert B Block

Reg. 22204

Patent attorney

Santa Barbara, CA · 93105

805-682-2502

William J Blonigan

Reg. 56162

Patent attorney

Windsor, CA · 95492

707-590-2365

Coe A Bloomberg

Reg. 26605

Patent attorney

Pacific Palisades, CA · 90272

310-459-3889

Howard W Bloomberg

Reg. 42335

Patent agent

San Francisco, CA · 94107

510-610-9984

Randall J Bluestone

Reg. 40518

Patent attorney

IBM Corporation

San Jose, CA · 95120

408-927-3386

Michael R Blum

Reg. 44543

Patent attorney

Quantcast Corporation

San Francisco, CA · 94103

415-738-4755

Robert E. Blumberg

Reg. 66808

Patent agent

Soquel Group

Santa Cruz, CA · 95060

831-426-8200

Bryan A Blumenkopf

Reg. 73282

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130-2040

213-892-5269

Mark Blumenkrantz

Reg. 40915

Patent agent

The Boeing Company

Seal Beach, CA · 90740

562-797-3649

David A Blumenthal

Reg. 26257

Patent attorney

Morrison & Foerster LLP

Los Angeles, CA · 90017

213-892-5200

Andrew P Blythe

Reg. 75014

Patent attorney

Gibson, Dunn & Crutcher

Irvine, CA · 92612-4412

949-451-3926

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?

9,553 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.