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 Davis Polk & Wardwell LLP, Dewey Engineering, Inc., and Dart NeuroScience LLC.

Top cities in California

All practitioners in California

Gareth E. DeWalt

Reg. 74731

Patent attorney

Davis Polk & Wardwell LLP

Menlo Park, CA · 94025

650-752-2072

Paul E Dewey

Reg. 54065

Patent agent

Dewey Engineering, Inc.

Poway, CA · 92064

858-748-3143

James D DeZazzo

Reg. 54931

Patent attorney

Dart NeuroScience LLC

San Diego, CA · 92121

858-736-3060

Kiranjit K Dhaliwal

Reg. 72274

Patent attorney

Apple, Inc.

Cupertino, CA · 94014

408-111-1111

Sanjeev K Dhand

Reg. 51182

Patent attorney

Dhand Law, PC

San Diego, CA · 92131

858-621-0672

Richa Dhindsa

Reg. 65377

Patent attorney

BASF

Mission Viejo, CA · 92692

858-649-3067

Michael A Di Nardo

Reg. 42487

Patent attorney

YK Law, LLP

Los Angeles, CA · 90071

213-401-0970

Yasir A. Diab

Reg. 80178

Patent agent

Steward IP, LLC

Belmont, CA · 94002

646-384-5378

Adam Louis Diament

Reg. 62219

Patent attorney

Diament Patent Law

Encino, CA · 91436

424-281-0162

David C Diamond

Reg. 47524

Patent agent

West Hills, CA · 91304

818-470-4020

J Drew Diamond

Reg. 46664

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

805-447-3541

Victoria M Diaz

Reg. 78261

Patent agent

Philips

San Diego, CA · 92130

858-201-0079

Espartaco Diaz Hidalgo

Reg. 60586

Patent agent

Qualcomm Incorporated

San Diego, CA · 92121

858-651-6395

John M DiBaise

Reg. 84497

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Menlo Park, CA · 94025

650-815-2612

Lucas T. Dibelius

Reg. 82516

Patent agent

Law Firm

Los Angeles, CA · 90071

208-412-1292

Marcus N DiBuduo

Reg. 64338

Patent attorney

Fennemore LLP

Fresno, CA · 93711

559-432-4500

Michael J. DiCato

Reg. 73923

Patent attorney

Perkins Coie LLP

Palo Alto, CA · 94304

650-838-4362

Michelle R Dick

Reg. 74054

Patent agent

Santa Clara, CA · 95051

650-475-0874

Esther R. Dickens

Reg. 68109

Patent attorney

Google Inc.

Mountain View, CA · 94043

650-214-4685

Robert William Dickerson· Jr

Reg. 29914

Patent attorney

Manatt, Phelps & Phillips LLP

Los Angeles, CA · 90064-1631

310-312-4000

Kari A. Dickinson

Reg. 60632

Patent agent

Loza & Loza, LLP

Upland, CA · 91786

858-258-6725

Mark Kevin Dickson

Reg. 32889

Patent attorney

Phase M Legal

San Mateo, CA · 94402-3989

650-346-6675

Karen R DiDomenicis

Reg. 38600

Patent agent

Chevron

Richmond, CA · 94802

510-242-4088

Benjamin N Diederich

Reg. 54067

Patent attorney

Law Office of Benjamin Diederich

Menifee, CA · 92586

951-332-7079

Gundo Diedrich

Reg. 55113

Patent agent

Diadexus

South San Francisco, CA · 94080-1913

650-246-6481

James J Diehl

Reg. 47527

Patent attorney

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Michael R Diekmann

Reg. 51617

Patent attorney

Lancaster, CA · 93536

661-275-7100

Louis Diep

Reg. 57778

Patent attorney

Nokia

Sunnyvale, CA · 94085

408-203-8397

Anthony B Diepenbrock· III

Reg. 39960

Patent attorney

San Jose, CA · 95120

408-927-9654

Michael P Dierks

Reg. 38857

Patent attorney

San Francisco, CA · 94118

408-314-8239

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.