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 RPX Corporation, Law Office of Robert R. Lerma, and Kleinberg & Lerner LLP.

Top cities in California

All practitioners in California

Justin J. Leong

Reg. 71258

Patent agent

Mountain View, CA · 94040

281-300-3867

Thomas J Lerdal

Reg. 61702

Patent attorney

RPX Corporation

San Francisco, CA · 94105

415-852-3111

Robert R Lerma

Reg. 50150

Patent attorney

Law Office of Robert R. Lerma

Camarillo, CA · 93010

805-276-2775

Marshall Aaron Lerner

Reg. 24108

Patent attorney

Kleinberg & Lerner LLP

Los Angeles, CA · 90067

310-557-1511

Rodney C Leroy

Reg. 53205

Patent attorney

Law Office of Rodney LeRoy

San Jose, CA · 95130

408-887-2166

William L Leschensky

Reg. 38951

Patent attorney

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

Alexander M Leshnick

Reg. 67144

Patent agent

USC Stevens Institute for Innovation

Los Angeles, CA · 90089

213-821-6064

James Francis Lesniak

Reg. 25240

Patent attorney

Knobbe Martens Olson & Bear

Irvine, CA · 92614

949-760-0404

Tina M Lessani

Reg. 41150

Patent attorney

Lessani Law Group, PC

Half Moon Bay, CA · 94019

650-712-0420

Michal M Leszczynski

Reg. 74245

Patent agent

sunnyvale, CA · 94085

727-204-2604

Brian C Leubitz

Reg. 54264

Patent attorney

San Francisco, CA · 94114

415-495-9015

Melissa R Leuenberger-Fisher

Reg. 47747

Patent attorney

Genentech

San Diego, CA · 92121

650-866-0572

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

Jacob D. Levenson

Reg. 83245

Patent agent

Ashurst Perkins Coie LLP

Palo Alto, CA · 94304

954-648-0255

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

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.