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 Arnold & Porter Kaye Scholer LLP, Knobbe, Martens, Olson & Bear, LLP, and Law Offices of Marcia E. Depew, PLC.

Top cities in California

All practitioners in California

Arti M. Denterlein

Reg. 76297

Patent agent

San Francisco, CA · 94127

415-337-0536

David S Denuyl

Reg. 71221

Patent attorney

Arnold & Porter Kaye Scholer LLP

Palo Alto, CA · 94306-2112

650-319-4551

Sandeep Deol

Reg. 67218

Patent attorney

Northridge, CA · 91325

213-972-4817

Jordan A DeOrio

Reg. 82102

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-721-2840

Marcia E Depew

Reg. 58448

Patent attorney

Law Offices of Marcia E. Depew, PLC

San Diego, CA · 92101

619-231-4115

Nathan L. Depew

Reg. 80024

Patent agent

Depew Engineering

Sunnyvale, CA · 94087

408-833-9251

Nicholas J. DePolo

Reg. 69833

Patent agent

Solana Beach, CA · 92075

858-793-6211

Stephen P Deren

Reg. 67532

Patent agent

San Bruno, CA · 94066

734-604-1063

Michael Edward Dergosits

Reg. 31243

Patent attorney

Dergosits & Noah LLP

San Francisco, CA · 94111

415-705-6377

Jason E. Derman

Reg. 74026

Patent attorney

Los Angeles, CA · 90045

818-331-4448

Jonathan M Dermott

Reg. 48608

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320-1799

805-447-4371

Wesley Derrick

Reg. 46659

Patent attorney

Palo Alto, CA · 94303

650-391-7323

Naishadh N Desai

Reg. 50630

Patent agent

Bio-Rad Laboratories

Hercules, CA · 94025

510--74-1-5054

Neil N Desai

Reg. 69905

Patent attorney

Wilson Sonsini Goodrich & Rosati PC

Los Angeles, CA · 90071

323-210-2912

Reena R Desai

Reg. 53833

Patent attorney

Mirati Therapeutics, Inc.

San Diego, CA · 92121

858-699-2877

Shibir H Desai

Reg. 72715

Patent agent

San Jose, CA · 95138

408-891-5320

Nancy J DeSantis-Vannice

Reg. 37608

Patent agent

San Mateo, CA · 94401

650-558-1506

Edward J DesJardins

Reg. 51162

Patent agent

McDermott, Will & Emery LLP

Menlo Park, CA · 94025

415-225-8458

Jeremy S. DesRosier

Reg. 68496

Patent attorney

Wisk Aero

Mountain View, CA · 94043

650-449-6575

Kathleen A. Determann

Reg. 60756

Patent attorney

Genomic Health, Inc

Redwood City, CA · 94063

650-569-2051

Peter A Detre

Reg. 52813

Patent attorney

Munger Tolles and Olson LLP

San Francisco, CA · 94105

415-512-4013

Jonathan Iain Max Detrixhe

Reg. 68556

Patent attorney

Red Smith LLP

San Francisco, CA · 94105

415-381-8700

David L. Devernoe

Reg. 50128

Patent attorney

Rimon, P.C.

Solana Beach, CA · 92075

858-768-4727

Francois Pierre deVilliers

Reg. 48200

Patent attorney

San Jose, CA · 95126

831-419-9589

Wendy L Devine

Reg. 61309

Patent attorney

Wilson, Sonsini, Goodrich & Rosati, PC

San Francisco, CA · 94105

415-947-2000

Andrew V Devkar

Reg. 76671

Patent attorney

Morgan, Lewis & Bockius LLP

Los Angeles, CA · 90067-3109

310-255-9070

David P Devlin

Reg. 55876

Patent attorney

Perkins Coie LLP

Santa Monica, CA · 90404

310-788-9900

Marcia Ann Devon

Reg. 31947

Patent attorney

Devon & Associates

Long Beach, CA · 90802

562-495-4000

Ronald D Devore

Reg. 39958

Patent agent

Abbott Vascular Inc.

Santa Clara, CA · 95054

408-845-1878

Dianna L DeVore

Reg. 42484

Patent agent

Convergent Law Group LLP

Mountain View, CA · 94043

650-641-2485

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.