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 Morrison and Foerster LLP, Safe Shepherd, and Fenwick & West LLP.

Top cities in California

All practitioners in California

Christine A Lekutis

Reg. 51934

Patent agent

Morrison and Foerster LLP

San Francisco, CA · 94105

415-268-7060

Samantha E. Leland

Reg. 70138

Patent attorney

Safe Shepherd

San Francisco, CA · 94110

415-230-0450

Avinash S Lele

Reg. 38950

Patent attorney

Palo Alto, CA · 94301

650-777-5501

Matthew C. Lem

Reg. 78040

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7636

Anthony J LeMaster-Farrimond

Reg. 69676

Patent attorney

Orange, CA · 92867

949-395-7427

Michael S Lemley

Reg. 42795

Patent attorney

Michael S. Lemley, Esq.

Palo Alto, CA · 94301

650-440-3096

Nancy J Lemm

Reg. 55371

Patent attorney

Lemm Firm

Manhattan Beach, CA · 90266

310-977-2987

Elsa Djuardi Lemoine

Reg. 45963

Patent attorney

Amgen Inc

Thousand Oaks, CA · 91320

805-447-3278

Robert F LeMoine

Reg. 50864

Patent attorney

Southern California Edison Company, Law Department

Rosemead, CA · 91770

626-302-4182

Amy R Lemyre

Reg. 54427

Patent attorney

Kirkland & Ellis LLP

San Francisco, CA · 94104

415-439-1453

Marina Len

Reg. 66112

Patent agent

Salix Pharmaceuticals, Inc.

Palo Alto, CA · 94301

650-849-5918

Jacqueline G Lendvai

Reg. 77269

Patent agent

Ladas & Parry LLP

Los Angeles, CA · 90010

323-934-2300

Mark D Lenhart

Reg. 53203

Patent agent

Berkeley, CA · 94704

650-464-7775

Karen J Lenker

Reg. 54618

Patent attorney

Davis Wright Tremaine LLP

Los Angeles, CA · 90071-3487

213-633-6800

Peter W Lenkey

Reg. 70553

Patent agent

Culver City, CA · 90230

818-679-7044

Alan M Lenkin

Reg. 40063

Patent attorney

Seyfarth Shaw LLP

Los Angeles, CA · 90067-3021

310-201-5262

Leslie A. Leonard

Reg. 59748

Patent agent

Agilent Technologies, Inc

Santa Clara, CA · 95052

408-553-7790

Diane U Leong

Reg. 39273

Patent agent

Gilead Sciences, Inc.

Foster City, CA · 94404

650-372-7626

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

Poseida Therapeutics

Cardiff By The Sea, CA · 92007

619-813-8904

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.