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 Brooks Kushman P.C. - Law Firm, Crowell & Moring, and Arista Networks, Inc..

Top cities in California

All practitioners in California

Sanford Astor

Reg. 20748

Patent attorney

Brooks Kushman P.C. - Law Firm

Los Angeles, CA · 90017

213-622-3003

Kainoa B Asuega

Reg. 64271

Patent agent

Crowell & Moring

Irvine, CA · 92614

949-798-1371

Nicholas D Atchison

Reg. 63446

Patent attorney

Arista Networks, Inc.

Santa Clara, CA · 95054

408-547-8087

Ali Atefi

Reg. 63960

Patent attorney

Solana Beach, CA · 92075

310-435-2451

Pavinderjit S Athwal

Reg. 51029

Patent attorney

Applied Signal Technology, Inc.

Sunnyvale, CA · 94086

408-522-3537

Holly J Atkinson

Reg. 69934

Patent attorney

San Jose, CA · 95126

866-877-4883

Michael B Atlass

Reg. 30606

Patent attorney

Qualcomm Technologies Inc.

San Diego, CA · 92121-1714

858-845-3163

Stuart C Atlow

Reg. 56503

Patent agent

Cisco Systems, Inc.

San Jose, CA · 95134-1706

919-392-7444

Nancy N Attalla

Reg. 81978

Patent attorney

Ropes and Gray

Palo Alto, CA · 94301

650-617-4717

Aliyar Attaran

Reg. 78695

Patent agent

Daly City, CA · 94014

707-782-3666

Stephen J Attle

Reg. 69279

Patent agent

El Cajon, CA · 92019

619-944-5339

John C. Attwood

Reg. 66805

Patent attorney

Los Angeles, CA · 90049

818-351-9852

Hin Meng Au

Reg. 62554

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3064

Roger H Au

Reg. 41591

Patent attorney

Chino Hills, CA · 91709

909-606-9388

Yiu F Au

Reg. 67529

Patent attorney

Au Law Office

Los Angeles, CA · 90071

323-366-1999

Artin G. Au-Yeung

Reg. 76443

Patent attorney

Exelixis, Inc,

Alameda, CA · 94502

415-364-8579

Lindsey A. Auerbach

Reg. 75433

Patent attorney

Costa Mesa, CA · 92627

949-546-5338

Leonard J Augustine· Jr

Reg. 54766

Patent attorney

Belmont, CA · 94002

650-592-3114

Rajpreet S. Aujla

Reg. 60060

Patent attorney

Aujla Legal

Pasadena, CA · 91101

833-285-5201

Jonathan P Aumais

Reg. 65710

Patent agent

Genentech, Inc

South San Francisco, CA · 94084

650-225-8715

James E Austin

Reg. 39489

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612-0250

510-663-1100

Shelton W. Austin

Reg. 60540

Patent attorney

Polsine!li PC

Los Angeles, CA · 90067

650-461-7707

Suzanne L Austin

Reg. 51168

Patent attorney

Agoura Hills, CA · 91376

805-552-0009

Stuart T Auvinen

Reg. 36435

Patent agent

g Patent LLC

Santa Cruz, CA · 95062

831-476-5506

Heather F Auyang

Reg. 47397

Patent attorney

Mill Valley, CA · 94942

202-297-5965

Sandy Auyoung

Reg. 54970

Patent agent

Sequenom, INC

San Diego, CA · 92121

858-202-9237

Patrick Avakian

Reg. 54971

Patent attorney

Canon,Inc.

Irvine, CA · 92618

949-932-3174

Akshay Avantsa

Reg. 77962

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7644

Mary B Aversano

Reg. 54972

Patent attorney

Studio City, CA · 91604

310-904-9380

Elohim D. Avery

Reg. 60388

Patent agent

Navair, Weapons Center, Weapons Division

China Lake, CA · 93555

760-939-8132

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.