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 Law Office of Allen M. Leung, A Professional Law Corp., Paradice and Li LLP, and Reichman Jorgensen Lehman & Feldberg LLP.

Top cities in California

All practitioners in California

Allen Leung

Reg. 50249

Patent attorney

Law Office of Allen M. Leung, A Professional Law Corp.

Irvine, CA · 92604

949-262-3282

Andrew H Leung

Reg. 55374

Patent attorney

Paradice and Li LLP

Campbell, CA · 95011

408-809-1789

Chak M Leung

Reg. 54265

Patent agent

Palo Alto, CA · 94301

650-325-5711

Jeff Leung

Reg. 65896

Patent attorney

Reichman Jorgensen Lehman & Feldberg LLP

Redwood Shores, CA · 94065

650-623-1447

Kevin Kook Tai Leung

Reg. 67243

Patent attorney

Vista IP Law Group LLP

Cupertino, CA · 95014

408-777-2904

Kim H Leung

Reg. 64399

Patent attorney

Fish & Richardson P.C.

San Diego, CA · 92130

858-678-4713

Sophia W Leung

Reg. 73703

Patent agent

Irvine, CA · 92620

214-477-9059

Kirsten J. Leute

Reg. 55375

Patent agent

Stanford University, Office of Technology Licensing

Palo Alto, CA · 94306

650-723-4374

Bradley J. Levang

Reg. 60251

Patent attorney

Fenton & Keller

Monterey, CA · 93942-0791

831-373-1241

Barbara M Level

Reg. 45483

Patent attorney

Danville, CA · 94526

925-719-5121

Louis R Levenson

Reg. 69220

Patent agent

McDermott Will & Emery LLP

Irvine, CA · 92614-2559

949-757-6329

David A Levine

Reg. 48821

Patent attorney

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-242-4210

Ronald E Levine

Reg. 50844

Patent attorney

Law Office Of Ronald E Levine

Costa Mesa, CA · 92626

714-432-6383

Karina Levitian

Reg. 75609

Patent attorney

San Francisco, CA · 94111

510-883-3606

Alma Prieto Levy

Reg. 43751

Patent attorney

Pacific Palisades, CA · 90272

310-883-4051

Andrew B Levy

Reg. 57183

Patent agent

Applied Logic Patents

Sherman Oaks, CA · 91403

503-805-3393

Daniel Matthew Guy Ho Levy

Reg. 60966

Patent attorney

O'Melveny & Myers LLP

San Francisco, CA · 94111

415-984-8990

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

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.