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 Impax Laboratories Inc, Morrison & Foerster, and Eastman & McCartney LLP.

Top cities in California

All practitioners in California

Huong T Nguyen

Reg. 55494

Patent attorney

Impax Laboratories Inc

Hayward, CA · 94544

510-404-4115

Jean Nguyen

Reg. 71051

Patent attorney

Morrison & Foerster

Los Angeles, CA · 90017-3543

213-892-5295

Joann M. Nguyen

Reg. 68512

Patent agent

Westminster, CA · 92683

949-864-6574

John B. Nguyen

Reg. 57560

Patent agent

Santa Clara, CA · 95054

408-727-7958

John Tuan N Nguyen

Reg. 62971

Patent attorney

San Francisco, CA · 94104-2332

415-317-3464

Kenny Nguyen

Reg. 73795

Patent attorney

Eastman & McCartney LLP

San Diego, CA · 92101

619-230-1144

Linh Han Hoang Nguyen

Reg. 71874

Patent attorney

Schwegman Lundberg & Woessner PA

San Jose, CA · 95113

612-373-6900

Lisa K Nguyen

Reg. 58018

Patent attorney

Paul Hastings LLP

Palo Alto, CA · 94304

650-320-1800

Louis-Vu T Nguyen

Reg. 58729

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1303

Martin H Nguyen

Reg. 50679

Patent attorney

Keller and Heckman LLP

San Francisco, CA · 94111

415-948-2814

Matthew V Nguyen

Reg. 71109

Patent attorney

Huntington Beach, CA · 92648

714-312-6826

Michael D K Nguyen

Reg. 66653

Patent attorney

Samsung Semiconductor, Inc.

San Jose, CA · 95134

408-544-4000

Michael T. Nguyen

Reg. 69784

Patent attorney

Patent Law Works, LLP

San Jose, CA · 95131

650-537-4506

Michelle Helen Nguyen

Reg. 902187

Limited recognition

University of San Diego School of Law

San Diego, CA · 92110

Minh Ledac Nguyen

Reg. 59838

Patent attorney

Intel Corporation

Santa Clara, CA · 95054

510-823-7410

My N Nguyen

Reg. 67357

Patent agent

Milpitas, CA · 95035

Natalie T. Nguyen

Reg. 58622

Patent attorney

NGUYEN PARTRIDGE, APC

San Diego, CA · 92127

858-225-9208

Ngoc-Ha T Nguyen

Reg. 68780

Patent agent

Salk Institute for Biological Studies

LaJolla, CA · 92037

858-755-8248

Nguyen Huu Nguyen

Reg. 43834

Patent agent

NGUYEN LLP

Irvine, CA · 92602

714-225-1008

Robert B Nguyen

Reg. 53388

Patent attorney

Law Offices of Robert B. Nguyen

Sacramento, CA · 95823

916-231-9200

Sally T. Nguyen

Reg. 78786

Patent attorney

San Diego, CA · 92129

510-456-6696

Sam L Nguyen

Reg. 52496

Patent attorney

Hamilton DeSanctis & Cha, LLP

Palo Alto, CA · 94306

650-565-8738

Thien T Nguyen

Reg. 43835

Patent attorney

Qualcomm, Inc.

San Diego, CA · 92121

858-651-6137

Thinh H Nguyen

Reg. 72205

Patent attorney

San Ramon, CA · 94583

925-854-7196

Thinh V Nguyen

Reg. 42034

Patent attorney

Private Practice

Huntington Beach, CA · 92647

714-360-4898

Thomas D Nguyen

Reg. 68590

Patent attorney

Santa Ana, CA · 92705

714-231-1523

Toan C Nguyen

Reg. 53389

Patent agent

Tustin, CA · 92782

714-832-9162

Triet M Nguyen

Reg. 64790

Patent attorney

Maschoff Brennan Gilmore Israelsen & Mauriel LLP

Irvine, CA · 92618

949-889-1690

Trinh X Nguyen

Reg. 48727

Patent attorney

Anaheim, CA · 92801

Trisha T. Nguyen

Reg. 84112

Patent agent

Fremont, CA · 94539

408-655-7706

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.