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 Condon-Johnson & Associates, Inc., Fenwick & West LLP, and Qualcomm Incorporated.

Top cities in California

All practitioners in California

Evan J Newman

Reg. 74717

Patent attorney

Condon-Johnson & Associates, Inc.

San Diego, CA · 92122

310-261-1206

Robert A Newman

Reg. 55492

Patent agent

Santa Clara, CA · 95050

408-296-0325

Zachary R. Newman

Reg. 75564

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

415-875-2271

Andrew M. Newton

Reg. 65543

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-5773

Allison J Neyer

Reg. 74765

Patent attorney

Northridge, CA · 91326-2837

818-360-9708

Andrew X Ng

Reg. 68864

Patent attorney

Invent Advisers, LLC

San Diego, CA · 92127

858-218-6714

Carmen S Ng

Reg. 61281

Patent attorney

Horizon IP LLC

Fremont, CA · 94539

510-868-4255

George K Ng

Reg. 54334

Patent attorney

Sorrento Therapeutics

San Diego, CA · 92122

858-210-3727

Greena Ng

Reg. 53382

Patent agent

San Mateo, CA · 94404

650-863-5126

Horace H Ng

Reg. 39315

Patent attorney

Lam Research Corporation

Fremont, CA · 94538

510-572-0200

Howard P Ng

Reg. 72204

Patent agent

Latham & Watkins LLP

San Francisco, CA · 94111

415-623-5469

Jennifer K Ng

Reg. 70938

Patent agent

Orrick Herrington & Sutcliffe LLP

Irvine, CA · 92614

415-773-5727

Rudy James Ng

Reg. 56741

Patent attorney

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Sharon S Ng

Reg. 53383

Patent attorney

Knobbe Martens Olson and Bear

Irvine, CA · 92614

949-760-0404

Stephen G. Ng

Reg. 63668

Patent attorney

NBCUniversal Media LLC

Universal City, CA · 91608

818-777-0059

Theresa J Ngai

Reg. 60522

Patent attorney

San Francisco, CA · 94116

Hieu D Ngo

Reg. 58798

Patent attorney

The Boeing Company

Seal Beach, CA · 90740

206-679-6937

Tiffany K Ngo

Reg. 66459

Patent agent

San Jose, CA · 95129

408-506-2486

Tuan V Ngo

Reg. 44259

Patent attorney

TSMC North America

San Jose, CA · 95134

408-678-2732

Van Ngoc Nguy

Reg. 55851

Patent attorney

Google Inc.

Mountain View, CA · 94043

An B Nguyen

Reg. 55975

Patent agent

Midway City, CA · 92655

714-914-6562

Anthony H. Nguyen

Reg. 75855

Patent agent

Wilson Sonsini Goodrich and Rosati

Palo Alto, CA · 94043

650-565-3631

Bao Nguyen

Reg. 46062

Patent attorney

Kirkland & Ellis LLP

San Francisco, CA · 94104

415-439-1425

Chris Dinh Nguyen

Reg. 54336

Patent attorney

Fitzpatrick Cella Harper and Scinto

Costa Mesa, CA · 92626

714-540-1053

Cindy N P Nguyen

Reg. 65449

Patent attorney

Cytori Therapeutics, Inc.

San Diego, CA · 92121

Dat T Nguyen

Reg. 63163

Patent attorney

Orrick, herrington & Sutcliffe, LLP

Los Angeles, CA · 90017

213-629-2020

Diem-Suong T Nguyen

Reg. 51175

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

Redwood Shores, CA · 94065

650-801-5000

Duy Duc Nguyen

Reg. 58979

Patent attorney

Los Altos, CA · 94024

650-270-1525

Frank Thanh D Nguyen

Reg. 39790

Patent attorney

Intuitive Surgical Operations Inc.

Sunnyvale, CA · 94086

408-523-2129

Hong Hao Ngoc Nguyen

Reg. 53386

Patent attorney

Zwierzchowski & Ngyen

Long Beach, CA · 90806

562-432-6522

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.