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 Lowenstein Sandler, Irell & Manella LLP, and Munger, Tolles & Olson LLP.

Top cities in California

All practitioners in California

Cameron J. Lindsay

Reg. 81963

Patent attorney

Lowenstein Sandler

Palo Alto, CA · 94301

650-847-4309

Jonathan M Lindsay

Reg. 45810

Patent attorney

Irell & Manella LLP

Newport Beach, CA · 92660

949-760-0991

Vincent Yung Ling

Reg. 67145

Patent attorney

Munger, Tolles & Olson LLP

Los Angeles, CA · 90071

213-683-9100

Susan Elaine Lingenfelter

Reg. 41156

Patent attorney

Amgen Inc

Thousand Oaks, CA · 91320

805-313-3010

Alexander Linger

Reg. 30532

Patent attorney

Northridge, CA · 91325

818-886-3305

Jason C. Linger

Reg. 76794

Patent attorney

Glaser Weil Fink Howard Avchen & Shapiro

Los Angeles, CA · 90067

310-553-3000

Deidre D Link

Reg. 57184

Patent attorney

Cetera Financial Group

El Segundo, CA · 90245

310-257-7474

Lawrence V Link· Jr

Reg. 24481

Patent agent

Studio City, CA · 91604

818-980-6258

Paul A Link

Reg. 53224

Patent agent

Martine Penilla & Gencarella, LLP

Sunnyvale, CA · 94085

408-774-6911

Roscoe T.H. Linstadt

Reg. 84238

Patent agent

San Diego, CA · 92117

805-636-9439

Lisa W Liou

Reg. 54275

Patent attorney

Arista Networks, Inc.

Santa Clara, CA · 95054

408-547-5775

Sandra Lee Lipkin

Reg. 47617

Patent attorney

Ventura, CA · 93006-3518

805-275-1861

Peter Adams Lipovsky

Reg. 32580

Patent attorney

US Navy - Office of the General Counsel

San Diego, CA · 92152

619-553-3824

Nicholas G. Lipperd

Reg. 83084

Patent agent

San Diego, CA · 92126

831-234-8725

Barret Lippey

Reg. 59266

Patent agent

Dolby Laboratories

San Francisco, CA · 94103

617-306-2646

Vincent P Liptak

Reg. 53225

Patent attorney

Rancho Santa Fe, CA · 92067

858-869-7829

Charles J Lisherness

Reg. 64778

Patent attorney

Cardiff, CA · 92007

760-634-3793

William F Liskow· III

Reg. 51256

Patent agent

Laguna Hills, CA · 92653

Charles P Litchfield

Reg. 68913

Patent attorney

San Rafael, CA · 94901

415-526-6333

Craig M. Litherland

Reg. 73457

Patent agent

San Jose, CA · 95138

650-380-0748

Alina L Litoshyk

Reg. 71960

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2369

Allan Z Litovsky

Reg. 40249

Patent attorney

The Litovsky Law Firm

Huntington Beach, CA · 92648

323-375-8008

Isaac J. Little

Reg. 84030

Patent agent

FENWICK & WEST LLP

Mountain View, CA · 94041

650-335-4948

Otis B Littlefield

Reg. 48751

Patent attorney

Morrison and Foerster LLP

San Francisco, CA · 94105

415-268-6846

Seth Forestier Littleford

Reg. 81829

Patent agent

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-646-2576

Paul B Littlepage

Reg. 48581

Patent attorney

Ben Lomond, CA · 95005

415-407-0538

Adam W Littman

Reg. 61014

Patent attorney

Adeli LLP

Los Angeles, CA · 90025

310-442-9300

Robert G Litts

Reg. 46876

Patent attorney

Candescent Law Group

Burlingame, CA · 94010

925-644-1102

Emmett J Litvak

Reg. 80919

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Agatha H. Liu

Reg. 65323

Patent attorney

Duane Morris LLP

Palo Alto, CA · 94301

650-847-4174

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.