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 Via LLP, Schwegman, Lundberg, Woessner & Kluth, and U.S. Department of Energy.

Top cities in California

All practitioners in California

Ginger R Dreger

Reg. 33055

Patent attorney

San Francisco, CA · 94127

415-810-4677

Angela K. Dremann

Reg. 72250

Patent attorney

Via LLP

Irvine, CA · 92614

949-625-5923

Camilla A Dresselhuys

Reg. 48960

Patent attorney

San Diego, CA · 92177

858-273-6114

Elena B Dreszer

Reg. 55128

Patent attorney

Schwegman, Lundberg, Woessner & Kluth

San Jose, CA · 95113-2009

408-278-4052

Gary R Drew

Reg. 34585

Patent attorney

U.S. Department of Energy

Berkeley, CA · 94720

510-486-6703

David D Dreyfuss

Reg. 60893

Patent agent

Moore Patents

SOQUEL, CA · 95073

831-431-6953

Michael G Dreznes

Reg. 59965

Patent attorney

BakerHostetler

Costa Mesa, CA · 92626

714-966-8806

Daniel F. Dries

Reg. 68111

Patent agent

Kilpatrick Townsend & Stockton

Menlo Park, CA · 94025

650-752-2445

Robert J Driscoll

Reg. 47536

Patent attorney

Deltagen INC

Menlo Park, CA · 94025

650-752-0264

Steven A. Driskill

Reg. 60005

Patent attorney

Sila Nanotechnologies Inc.

Alameda, CA · 94501

804-516-6954

Markus A Drumm

Reg. 54077

Patent agent

Loleta, CA · 95551

707-733-5799

Wenyue Du

Reg. 75498

Patent agent

Cedars-Sinai Medical Center

Los Angeles, CA · 90036

615-498-1308

Yangzhou H Du

Reg. 65310

Patent agent

Metis IP LLC

Newark, CA · 94560

732-501-5481

Yixue Du

Reg. 75581

Patent agent

Park, Vaughan, Fleming & Dowler, LLp

Davis, CA · 95618

530-204-4044

Jason J. Du Mont

Reg. 59083

Patent attorney

Stanford Law School

Stanford, CA · 94305

773-828-9007

Uttam G Dubal

Reg. 59202

Patent attorney

Arista Networks, Inc.

Santa Clara, CA · 95054

408-547-5955

Hubert E Dubb

Reg. 25329

Patent attorney

Belmont, CA · 94002

650-591-4243

John Edward Dubiansky

Reg. 67692

Patent attorney

Dolby Laboratories, Inc.

San Francisco, CA · 94103

415-645-5362

Alla Dubrovsky

Reg. 55131

Patent attorney

Palo Alto, CA · 94303

415-596-3002

Dennis A Duchene

Reg. 40595

Patent attorney

Qualcomm Inc.

San Diego, CA · 92121

858-658-1456

Peter R Duchesneau

Reg. 38861

Patent attorney

Manatt, Phelps & Phillips, LLP

Los Angeles, CA · 90064

310-312-4209

Elizabeth R Duckett

Reg. 55132

Patent attorney

San Francisco, CA · 94103

David G Duckworth

Reg. 39516

Patent attorney

Russo & Duckworth, LLP

Irvine, CA · 92618

949-724-1255

Lara J. Dueppen

Reg. 65002

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320-1789

818-297-4735

Jonathan J Duffield

Reg. 60392

Patent attorney

Genentech Inc.

South San Francisco, CA · 94080

650-866-2007

Devanie A DuFour

Reg. 65026

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

202-640-6400

Bradford James Duft

Reg. 32219

Patent attorney

CoDa Therapeutics

San Diego, CA · 92121

858-677-0474

DeeAnn Dugan

Reg. 44662

Patent attorney

DeeAnn Dugan, Attorney at Law

Castro Valley, CA · 94546

510-537-1754

Jeremy M Duggan

Reg. 55133

Patent attorney

Beck, Bismonte & Finley, LLP

San Jose, CA · 95113

408-938-7900

Christopher J Dugger

Reg. 55134

Patent attorney

SoCal IP Law Group

Westlake Village, CA · 91362

805-724-4748

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.