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 Carr & Ferrell LLP, Extreme Networks, and RL Patents, LLC/Outsource Asia, LLC.

Top cities in California

All practitioners in California

Christine Shui-wah Lam

Reg. 37489

Patent attorney

Los Altos, CA · 94024

650-965-4097

Colin N. Lam

Reg. 84343

Patent agent

Redwood City, CA · 94061

650-245-4185

Joanne Chung Yan Lam

Reg. 69868

Patent attorney

Carr & Ferrell LLP

Menlo Park, CA · 94025

650-812-3487

Kendrick P. Lam

Reg. 71490

Patent agent

Torrance, CA · 90503

852-915-09858

Peter Lam

Reg. 44855

Patent agent

Extreme Networks

San Jose, CA · 95119

408-352-2479

Ricky Q. Lam

Reg. 72045

Patent agent

RL Patents, LLC/Outsource Asia, LLC

San Francisco, CA · 94132

415-730-9244

Samuel T Lam

Reg. 71105

Patent attorney

Electronic Arts Inc.

Redwood City, CA · 94065

650-628-7810

Scott A Lam

Reg. 56108

Patent attorney

Rosemead, CA · 91770

415-300-4323

Shannon H. Lam

Reg. 65614

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Vincent S Lam

Reg. 53177

Patent attorney

DLA Piper LLP (US)

San Diego, CA · 92101-4297

619-699-2867

Wilfred H Lam

Reg. 41923

Patent attorney

Innovation Management Sciences

Los Altos, CA · 94023-1169

650-969-8300

Owen Lester Lamb

Reg. 20831

Patent agent

Soluang, CA · 93464-1655

805-688-4916

Beverly J. Lamberson

Reg. 78007

Patent attorney

Lowenstein Sandler

Palo Alto, CA · 94301

650-433-5610

Jonathan J Lamberson

Reg. 57352

Patent attorney

White & Case LLP

Palo Alto, CA · 94306

650-213-0300

Brian K Lambert

Reg. 60708

Patent attorney

Paradice and Li LLP

Los Gatos, CA · 95032

408-214-9222

Niccola J Lambert

Reg. 41138

Patent agent

Niccola Lambert

San Jose, CA · 95135

408-270-9627

William R Lambert

Reg. 44857

Patent attorney

Sheppard Mullin Richter & Hampton LLP

Menlo Park, CA · 94025

650-815-2644

Michael L Lamberty

Reg. 50760

Patent agent

Atheer.

Mountain View, CA · 94043

256-479-5590

Christopher M Lambrecht

Reg. 64725

Patent agent

InTouch Technologies, Inc.

Goleta, CA · 93117

805-562-8686

Matthew F Lambrinos

Reg. 56909

Patent agent

Franklin & Associates International LLC

Palo Alto, CA · 94301

650-391-7831

Jiarong L Lamiquiz

Reg. 73844

Patent attorney

WILSON SONSINI GOODRICH & ROSATI

Palo Alto, CA · 94304

650-849-3125

Eric Ross Lamison

Reg. 44859

Patent attorney

LAMISON PC

Orinda, CA · 94563

415-407-0596

Cynthia S. Lamon

Reg. 73334

Patent agent

Lamon Patent Services

WILLITS, CA · 95490

707-489-6455

Erin E. M. LaMontagne

Reg. 83317

Patent agent

San Diego, CA · 92111

714-514-1688

Sunny K LaMoreux

Reg. 47986

Patent attorney

SAUSD

Santa Ana, CA · 92704

949-923-1402

Thomas Raymond Lampe

Reg. 22454

Patent attorney

Bielen, Lampe & Thoeming

Concord, CA · 94520

925-288-9720

Gregory S Lampert

Reg. 35581

Patent attorney

LEWIS ROCA ROTHGERBER CHRISTIE LLP

Glendale, CA · 91209-9001

626-795-9900

Michael V Lancaster

Reg. 51915

Patent agent

Bakersfield, CA · 93306

760-417-9180

John Frederic Land

Reg. 29554

Patent attorney

Jaquez Land Greenhaus & McFarland LLP

San Diego, CA · 92121

858-453-2004

Joel G Landau

Reg. 54732

Patent attorney

L3Harris Technologies, Inc.

Carpintieria, CA · 93104

818-739-9496

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.