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 Amgen Inc., Dexcom, Inc., and Ligand Pharmaceuticals Incorporated.

Top cities in California

All practitioners in California

Camryn P. Berk

Reg. 78462

Patent attorney

Solana Beach, CA · 92075

480-358-7522

Joshua D. Berk

Reg. 73591

Patent agent

Dexcom, Inc.

San Diego, CA · 92121

732-236-2758

Charles S Berkman

Reg. 38077

Patent attorney

Ligand Pharmaceuticals Incorporated

La Jolla, CA · 92037

858-550-7835

Edward H Berkowitz

Reg. 27771

Patent attorney

Palo Alto, CA · 94306

650-494-2099

Matthew G Berkowitz

Reg. 57215

Patent attorney

Shearman & Sterling, LLP

Menlo Park, CA · 94025

650-838-3737

Kimberly L Berkowski

Reg. 65017

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320-1799

180-531-32533

Brian M Berliner

Reg. 34549

Patent attorney

O'Melveny and Myers LLP

Los Angeles, CA · 90071

213-430-7424

Matthew A Berliner

Reg. 53986

Patent attorney

Brown, Wegner & Berlinger

Irvine, CA · 92614

949-705-0080

Robert Berliner

Reg. 20121

Patent attorney

Los Angeles, CA · 90017-5780

213-266-4586

Ashley M Berman

Reg. 77215

Patent agent

Morrison, and Foerster, LLP

San Francisco, CA · 94105

415-268-6672

Benjamin E Berman

Reg. 61507

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Palo Alto, CA · 94301

650-815-2608

Charles Berman

Reg. 29249

Patent attorney

Hemopet

Santa Monica, CA · 90403

310-828-4804

Rod S Berman

Reg. 31483

Patent attorney

Jeffer Mangels Butler & Marmaro LLP

Los Angeles, CA · 90067

310-201-3517

Jeffery P Bernhardt

Reg. 54997

Patent attorney

Allogene Therapeutics, Inc.

South San Francisco, CA · 94080

650-457-2592

William S Bernheim

Reg. 27180

Patent attorney

Bernheim Gutierrez Levin and Mccready

Dixon, CA · 95620

707-678-4447

Eric Anthony Bernsen

Reg. 71624

Patent attorney

Apple Inc.

San Diego, CA · 92121

619-944-4720

Frank L Bernstein

Reg. 31484

Patent attorney

Squire Patton Boggs LLP

Palo Alto, CA · 94304

650-865-6500

Laurel S Bernstein

Reg. 37280

Patent agent

OmniAb, Inc.

Emeryville, CA · 94608

510-291-0020

Robert L Bernstein

Reg. 46020

Patent attorney

Amgen Inc.

South San Francisco, CA · 94080

650-640-9526

Scott N Bernstein

Reg. 38827

Patent attorney

Kite Pharma, Inc.

Santa Monica, CA · 90404

310-742-2845

Frederick S Berretta

Reg. 38004

Patent attorney

San Diego, CA · 92130

Robert J Berry

Reg. 65424

Patent attorney

Thousand Oaks, CA · 91361

805-379-1215

Olga Berson

Reg. 55001

Patent attorney

Thompson Coburn LLP

Los Angeles, CA · 90067

310-282-2563

Pamela W. Bertani

Reg. 41525

Patent attorney

Law Offices of John T. Costello

Sacramento, CA · 95814

916-441-2234

Matthew S. Bertenthal

Reg. 61129

Patent attorney

Tivo Inc.

Santa Clara, CA · 95054

408-519-9100

Thomas R Berthold

Reg. 28689

Patent attorney

Saratoga, CA · 95070-4570

408-396-8411

Thomas M Bertolini

Reg. 56506

Patent agent

University of California

Irvine, CA · 92627

949-824-5628

Jennifer L Best-Martin

Reg. 61188

Patent agent

Johnson & Johnson

San Diego, CA · 92121

619-631-3721

Thomas Bethea· Jr

Reg. 53987

Patent attorney

Qualcomm

San Diego, CA · 92121

858-587-1121

George F Bethel

Reg. 22985

Patent attorney

Cambro Manufacturing Company

Huntington Beach, CA · 92647

714-230-4315

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.