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 Nixon Peabody LLP, Alere Inc., and Knobbe, Martens, Olson & Bear, LLP.

Top cities in California

All practitioners in California

George S Levy

Reg. 53211

Patent agent

Irvine, CA · 92603

858-259-2226

Ron Karl Levy

Reg. 31539

Patent attorney

Moorpark, CA · 93021

805-529-3188

Seth David Levy

Reg. 44869

Patent attorney

Nixon Peabody LLP

Los Angeles, CA · 90071-3151

213-629-6000

Belinda M Lew

Reg. 53212

Patent attorney

Alere Inc.

San Diego, CA · 92121

858-805-2822

Wesley W Lew

Reg. 64169

Patent attorney

Pasadena, CA · 91106

626-356-0988

Thomas Paul Lewandowski

Reg. 26478

Patent agent

Ladera Ranch, CA · 92694

949-429-2421

Adam F. Lewental

Reg. 73527

Patent agent

Santa Monica, CA · 90404

732-513-0621

Brian Lewis

Reg. 32502

Patent attorney

Los Altos, CA · 94024

650-961-0203

Case A. Lewis

Reg. 60518

Patent attorney

Ventura, CA · 93001

619-400-9397

Celia L. Lewis

Reg. 84720

Patent agent

Santa Clara, CA · 95050

832-443-5540

Christopher L. Lewis

Reg. 79031

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

202-640-6433

David Lewis

Reg. 33101

Patent agent

Poway, CA · 92064

408-993-1800

Donald George Lewis

Reg. 28636

Patent agent

Lewis Kohn & Walker, LLP

San Diego, CA · 92128

858-436-1330

Jean L Lewis

Reg. 43752

Patent attorney

Huntington Beach, CA · 92648

Lindsey S Lewis

Reg. 81786

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-239-5375

Terrell P Lewis

Reg. 29227

Patent attorney

Fallbrook, CA · 92028

760-458-8261

Tristan D. Lewis

Reg. 79908

Patent agent

Anaheim, CA · 92808

714-814-5226

Yan Leychkis

Reg. 60440

Patent attorney

Illumina, Inc.

San Diego, CA · 92122

858-291-6118

Arrienne Monique Lezak

Reg. 51943

Patent attorney

Polsinelli

Palo Alto, CA · 94025

703-627-5458

Alex S. Li

Reg. 68773

Patent attorney

Teradata

San Diego, CA · 92127

858-485-4000

Benjamin Chun Yeung Li

Reg. 76855

Patent attorney

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5671

Bin Li

Reg. 75561

Patent attorney

Goertek Electronics Inc.

Santa Clara, CA · 95054

408-542-9710

Chia-Chi Li

Reg. 64856

Patent agent

KILPATRICK TOWNSEND & STOCKTON, LLP

San Francisco, CA · 94111

415-576-0200

Feng Li

Reg. 75048

Patent agent

San Jose, CA · 95131

650-340-3061

Fengling Li

Reg. 62962

Patent attorney

Intel Corporation

Santa Clara, CA · 95054-1549

408-765-7794

Hao Li

Reg. 59577

Patent agent

Wilson Sonsini Goodrich & Rosati, P.C.

Palo Alto, CA · 94304

650-565-3922

James Yuanxin Li

Reg. 35546

Patent attorney

Oakland, CA · 94610-2730

415-894-5271

Jessica Y Li

Reg. 78504

Patent agent

Redwood City, CA · 94063

650-839-5061

Jie Li

Reg. 56681

Patent agent

Greenberg Traurig LLP

San Francisco, CA · 94111

415-655-1255

Jing J Li

Reg. 44871

Patent attorney

LiLaw

Cupertino, CA · 95015

650-521-5813

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.