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 Knobbe, Martens, Olson and Bear, Haynes and Boone, LLP, and Affirm, Inc..

Top cities in California

All practitioners in California

Peter J Law

Reg. 72722

Patent attorney

Knobbe, Martens, Olson and Bear

Irvine, CA · 92614

858-707-4243

Don Carlos Lawrence

Reg. 31975

Patent attorney

Haynes and Boone, LLP

Costa Mesa, CA · 92626

949-202-3000

Scott W Laws

Reg. 51111

Patent attorney

Carlsbad, CA · 92011

760-994-7317

Tara M Lay

Reg. 70171

Patent attorney

Affirm, Inc.

San Francisco, CA · 94108

704-439-6141

Spyros James Lazaris

Reg. 45981

Patent attorney

Lazaris IP, Inc.

Los Angeles, CA · 90045

310-889-0740

Han K. Le

Reg. 82779

Patent agent

Berkeley, CA · 94709

714-333-8348

Kevin Le

Reg. 79420

Patent agent

San Leandro, CA · 94578

510-303-2996

Trung-Kien T Le

Reg. 44863

Patent attorney

The Aerospace Corporation

El Segundo, CA · 90245

310-336-6242

Uyen D Le

Reg. 58214

Patent attorney

The Law Office of Uyen D. Le

San Diego, CA · 92105

619-283-2808

Stephen J Le Blanc

Reg. 36579

Patent attorney

Law Offices of Stephen J. LeBlanc

Oakland, CA · 94612

510-388-7089

Arthur E Leach

Reg. 48566

Patent attorney

Glendora, CA · 91741

626-335-2314

Erin M B Leach

Reg. 67666

Patent agent

Orrick, Herrington, and Sutcliffe LLP

Irvine, CA · 92614

949-852-7766

Nicholas Nathaniel Leach

Reg. 31776

Patent attorney

Chevron Corporation

San Ramon, CA · 94583-2324

925-842-1534

Nathaniel T Leachman

Reg. 68911

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2227

Peter Rocco Leal

Reg. 24226

Patent attorney

Power Integrations

Auburn, CA · 95603

408-414-9517

Sierra K Lear

Reg. 82304

Patent agent

Morrison & Foerster LLP

Palo Alto, CA · 94304-1018

415-205-9525

George Brian Leavell

Reg. 45436

Patent attorney

Law Office of George Leavell

Merced, CA · 95340

408-710-2532

Thomas F Lebens

Reg. 38221

Patent attorney

Fitch, Even, Tabin & Flannery, LLP

San Luis Obispo, CA · 93406

805-548-1800

Jonathan L Lederman

Reg. 67572

Patent attorney

Sunnyvale, CA · 94087

650-793-5518

Daniel D Ledesma

Reg. 57181

Patent attorney

Hickman Palermo Truong BeckerBingham Wong LLP

San Jose, CA · 95113

408-414-1229

Aric Wade Ledford

Reg. 63663

Patent agent

Fluidigm Corporation

South San Francisco, CA · 94080

650-243-6659

Roy LeDuc

Reg. 34620

Patent agent

San Francisco, CA · 94103

415-793-2358

Albert S Lee

Reg. 55366

Patent attorney

Dali Wireless

Menlo Park, CA · 94025

855-250-5082

Albert J. Lee

Reg. 61673

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626-7653

714-830-0600

Alex Lee

Reg. 72950

Patent agent

Gunderson Dettmer

San Diego, CA · 92130

858-436-8057

Alexander S. Lee

Reg. 71257

Patent attorney

Los Angeles, CA · 90010-1211

310-347-8235

Alexander Hyung-Joon Lee

Reg. 62239

Patent attorney

White & Case LLP

Palo Alto, CA · 94306

650-213-0314

Andrew J Lee

Reg. 60371

Patent attorney

Fountainhead Law Group, P.C.

Santa Clara, CA · 95050

408-244-6319

Andrew D Lee

Reg. 62005

Patent attorney

Precision Patents, P.C.

Irvine, CA · 92602

949-415-8455

Andrew C Lee

Reg. 68977

Patent attorney

HG LAW LLP

San Jose, CA · 95113

510-304-9211

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.