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 Qualcomm, Inc., The Law Offices Of Valerie E. Looper, and Kilpatrick Townsend & Stockton, LLP.

Top cities in California

All practitioners in California

Timothy F Loomis

Reg. 37383

Patent attorney

Qualcomm, Inc.

San Diego, CA · 92121

858-845-8355

Valerie E Looper

Reg. 33007

Patent attorney

The Law Offices Of Valerie E. Looper

Vista, CA · 92084

410-804-7238

Brad J Loos

Reg. 51968

Patent agent

Kilpatrick Townsend & Stockton, LLP

Menlo Park, CA · 94025

650-324-6369

Eli A Loots

Reg. 54715

Patent attorney

Oakland, CA · 94611

510-684-6943

Rory R. Lootsma

Reg. 800104

Limited recognition

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Jorge A. Lopez

Reg. 55404

Patent agent

Downey, CA · 90242

856-577-3155

Margarita Lopez

Reg. 78083

Patent attorney

Lancaster, CA · 93534

661-609-6176

Miguel A. Lopez

Reg. 71507

Patent agent

Los Angeles, CA · 90067

310-229-9904

Theodore P Lopez

Reg. 44881

Patent attorney

Klein, O'Neill & Singh LLP

Irvine, CA · 92612

949-955-1920

Andrea E. Lopez Giraldo

Reg. 84141

Patent agent

West Hills, CA · 91307

818-299-4428

Matthew Clay Loppnow

Reg. 45314

Patent attorney

Hickman Becker Bingham Ledesma LLP

Campbell, CA · 95008

408-414-1080

John E Lord

Reg. 56562

Patent attorney

Skiermont Derby LLP

Los Angeles, CA · 90071

213-788-4500

Todd A Lorenz

Reg. 39754

Patent attorney

Arnold & Porter LLP

San Francisco, CA · 94111

415-471-3295

D'Arcy H Lorimer

Reg. 53239

Patent agent

Lorimer Labs

Pismo Beach, CA · 93449

805-473-0659

Bradley K Lortz

Reg. 45472

Patent attorney

Canady & Lortz

Los Angeles, CA · 90010

626-292-7743

Oliver C Loson

Reg. 73704

Patent agent

1200 Pharma, LLC

Culver City, CA · 90230

424-652-9375

Jeffrey J. Lotspeich

Reg. 45737

Patent attorney

Lee Hong Degerman Kang & Waimey

Los Angeles, CA · 90017

213-623-2221

Mikhail Lotvin

Reg. 36859

Patent attorney

Mikhail Lotvin

San Jose, CA · 95170

408-821-3582

Kam C Louie

Reg. 33008

Patent attorney

Ladas and Parry

Los Angeles, CA · 90036

323-934-2300

Michael L Louie

Reg. 36988

Patent attorney

Beyer Law Group LLP

Palo Alto, CA · 94303

650-842-1300

Daniel Louis

Reg. 81914

Patent agent

Los Angeles, CA · 90048

310-912-4003

Richard B Love

Reg. 34659

Patent attorney

Pharmacyclics, Inc.

Sunnyvale, CA · 94085

408-774-3379

Brett A Lovejoy

Reg. 42813

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1211

David Eugene Lovejoy

Reg. 22748

Patent attorney

Novato, CA · 94949-8210

415-612-4047

J. Blake Lovelace

Reg. 55405

Patent agent

Encinitas, CA · 92024

760-753-0528

Eric B. Lovell

Reg. 75337

Patent attorney

Dexcom Inc.

San Diego, CA · 92121

858-203-6931

Kristen E. Lovin

Reg. 72821

Patent attorney

NVIDIA Corporation

Santa Clara, CA · 95051

408-486-2000

Jaric E Loving

Reg. 73417

Patent attorney

Innovent Law, PC

Aliso Viejo, CA · 92656

949-429-0212

Michael L Lovitz

Reg. 33953

Patent attorney

Lovitz IP Law PC

West Hollywood, CA · 90069

323-337-9088

Paul A. Lovrich

Reg. 60857

Patent attorney

Campbell, CA · 95011-2214

408-823-4554

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.