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 Goodwin Procter, Nixon Peabody LLP, and Power Integrations, Inc..

Top cities in California

All practitioners in California

John R Leflar

Reg. 39744

Patent agent

Sunnyvale, CA · 94087

408-735-8172

Max Stefan Genuist Legg

Reg. 800182

Limited recognition

Goodwin Procter

San Francisco, CA · 94105

415-733-6295

Corey T Leggett

Reg. 70017

Patent agent

Nixon Peabody LLP

San Francisco, CA · 94111

415-984-8340

Ji Lei

Reg. 65322

Patent attorney

Power Integrations, Inc.

San Jose, CA · 95138

408-414-8549

Leong Chi Lei

Reg. 50402

Patent agent

A and J Intrntl Patent Office

Walnut Creek, CA · 94598

480-561-4607

Yi-Shu V. Lei

Reg. 71496

Patent attorney

Gibson Dunn & Crutcher, LLP

Palo Alto, CA · 94304

650-815-2600

James D Leimbach

Reg. 34374

Patent agent

Leimbach Assoctiates

San Diego, CA · 92117

858-483-8761

Justin J Leisey

Reg. 65082

Patent attorney

Abbott Vascular Inc,

Santa Clara, CA · 95054

408-239-3004

Theodore James Leitereg

Reg. 28319

Patent attorney

Temecula, CA · 92591-7936

602-369-1751

Rachel V Leiterman

Reg. 46868

Patent attorney

Patent Law Group LLP

Mountain View, CA · 94043

650-965-8005

Cody R. LeJeune

Reg. 57671

Patent attorney

Lerach Coughlin et al, LLP

San Diego, CA · 92101

619-231-1058

Christian M. C. Lek

Reg. 76369

Patent attorney

Los Angeles, CA · 90031

909-961-9988

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

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.