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 Mintz, Desmarais LLP, and Shearman & Sterling, LLP.

Top cities in California

All practitioners in California

Mingyue Bao

Reg. 800087

Limited recognition

Mintz

Los Angeles, CA · 90067

310-586-3200

Ning Bao

Reg. 62646

Patent agent

Mountain View, CA · 94043

650-860-5168

YuKai Bao

Reg. 79686

Patent agent

Desmarais LLP

San Francisco, CA · 94111

415-573-1822

Zheng Bao

Reg. 56158

Patent attorney

Shearman & Sterling, LLP

Menlo Park, CA · 94025

650-838-3600

James P Barabas

Reg. 46536

Patent attorney

KRAMER ALBERTI LIM & TONKOVICH LLP

Foster City, CA · 94404

650-514-2742

Alexandra J Baran

Reg. 39101

Patent agent

A. J. Baran Consulting. Inc.

MOUNTAIN VIEW, CA · 94040

650-938-3300

Robert J Baran

Reg. 25806

Patent attorney

Laguna Niguel, CA · 92677

949-363-1925

Sony B Barari

Reg. 56656

Patent attorney

Thomas, Whitelaw, Tyler LLP

San Francisco, CA · 94111

415-820-0426

Justin R. Baratz

Reg. 68076

Patent attorney

Hickman Palermo Truong Becker Bingham Wong LLP

San Jose, CA · 95113

408-414-1222

Harsh M. Barbhaiya

Reg. 78285

Patent agent

Hover Inc.

San Francisco, CA · 94104

408-206-7663

Reynaldo C Barcelo

Reg. 42290

Patent attorney

Barcelo & Harrison, LLP

Newport Beach, CA · 92663

949-340-9736

Michael Barclay

Reg. 32553

Patent attorney

Menlo Park, CA · 94025

650-853-1711

Elisabeth Jaffe Barek

Reg. 46797

Patent attorney

Menlo Park, CA · 94025

John E Bargero

Reg. 50017

Patent attorney

San Francisco, CA · 94123

415-474-9488

Adrian Barker

Reg. 75546

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

415-730-6373

M Paul Barker

Reg. 32013

Patent attorney

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304-1203

650-849-6600

Scott A Barker

Reg. 65188

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-651-9562

Christopher M Barkley

Reg. 64329

Patent agent

Fitzpatrick Cella Harper & Scinto

Costa Mesa, CA · 92626

714-540-8700

Jonathan S Barlow

Reg. 57317

Patent agent

Sunnyvale, CA · 94086

801-830-5183

Brian C. Barnes

Reg. 75805

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-721-5242

Glenn D Barnes

Reg. 42293

Patent attorney

Murabito, Hao & Barnes

San Jose, CA · 95113

408-938-9080

Kari L Barnes

Reg. 60499

Patent attorney

Kari L Barnes ESQ

Irvine, CA · 92612

714-260-2640

David A Barnett

Reg. 80741

Patent agent

NEWPORT BEACH, CA · 92660

714-768-9361

Deborah H. Barnette

Reg. 70385

Patent attorney

Simi Valley, CA · 93065

919-302-9054

Jonathan A Barney

Reg. 34292

Patent attorney

Law Offices Jonathan A Barney

Newport Beach, CA · 92663

949-395-2535

Seth E Barney

Reg. 61187

Patent attorney

Canon U.S.A., Inc.

Irvine, CA · 92612

949-932-3128

David S Barnhill

Reg. 72376

Patent attorney

Chang & Hale LLP

Irvine, CA · 92612

949-336-1454

Jeffrey S Baron

Reg. 62555

Patent agent

Santa Clara, CA · 95050

408-390-6466

Hitesh S Barot

Reg. 51433

Patent attorney

Bingham McCutchen LLP

San Francisco, CA · 94111

415-393-2746

Kenneth Barovsky

Reg. 36442

Patent attorney

San Diego, CA · 92128

858-774-8129

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.