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 Vir Biotechnology, Inc., Amgen Inc., and Reuben Raucher & Blum.

Top cities in California

All practitioners in California

Jenny Hartrum

Reg. 43663

Patent attorney

Vir Biotechnology, Inc.

San Francisco, CA · 94158

650-522-1871

William H Hartwell

Reg. 70040

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320-1789

608-709-6110

Trenton E. Hartzler

Reg. 77412

Patent attorney

Reuben Raucher & Blum

Los Angeles, CA · 90025

310-777-1990

Sean S. Harvey

Reg. 84476

Patent agent

Encinitas, CA · 92024

650-353-0431

Janet E Hasak

Reg. 28616

Patent attorney

Chico, CA · 95928

530-809-9056

Syed A Hasan

Reg. 41057

Patent attorney

LEWIS ROCA ROTHGERBER CHRISTIE LLP

Glendale, CA · 91203

626-795-9900

Erick K. Hasegawa

Reg. 69546

Patent attorney

Rivian Automotive, LLC

Irvine, CA · 92606

949-836-3469

Majid M Hashemi

Reg. 65805

Patent agent

San Jose, CA · 95160

408-483-8349

Daniel S. Hashimi

Reg. 68538

Patent attorney

Pasadena, CA · 91101

(62-6) -793-9364

Takashi Hashimoto

Reg. 47635

Patent attorney

TE Connectivity Corporation

Fremont, CA · 94555

650-361-5875

Judith A Hasko

Reg. 41819

Patent attorney

Latham & Watkins, LLP

Menlo Park, CA · 94025

650-463-3065

Averie K Hason

Reg. 57722

Patent attorney

Seagate Technology LLC

Fremont, CA · 94538

510-661-1000

Katherine D. Hasper

Reg. 75123

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3474

Michael T Hasper

Reg. 58934

Patent attorney

NVIDIA Corporation

Santa Clara, CA · 95050

408-486-2000

Saad K. Hassan

Reg. 70223

Patent attorney

Fenwick & West

Mountain View, CA · 94041

650-335-7182

Steve P Hassid

Reg. 46762

Patent attorney

Partners Law Group

Santa Monica, CA · 90403

310-922-2206

Evan L Hastings

Reg. 78745

Patent attorney

NIWC Pacific

San Diego, CA · 92125

602-717-6462

Ryan E Hatch

Reg. 55252

Patent attorney

Law Office of Ryan E. Hatch

Los Angeles, CA · 90066

310-279-5076

Cynthia D. Hathaway

Reg. 59735

Patent attorney

Global Patent Group Inc.

BURBANK, CA · 91506

877-812-8020

Benjamin W Hattenbach

Reg. 41820

Patent attorney

Irell and Manella, LLP

Los Angeles, CA · 90067

310-277-1010

David M Haugen

Reg. 53000

Patent attorney

Fox Factory, INC

Watsonville, CA · 95076

831-274-8336

James Le Roy Haugen

Reg. 53001

Patent attorney

Livermore, CA · 94550

925-454-1318

John E Haugen

Reg. 60782

Patent attorney

Stanford University

Stanford, CA · 94305

650-725-7575

Paul C Haughey

Reg. 31836

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

San Francisco, CA · 94111

415-273-4787

David L Hauser

Reg. 42643

Patent attorney

Edwards Lifesciences LLC

Irvine, CA · 92614

949-250-6878

Robert Scott Hauser

Reg. 37847

Patent attorney

Fitbit, Inc.

San Francisco, CA · 94105

415-377-6518

Matthieu V. Hausig

Reg. 83978

Patent attorney

Scale LLP

San Francisco, CA · 94104

415-735-5933

Eric R Havens

Reg. 70539

Patent attorney

Imperial County Counsel

El Centro, CA · 92243

442-265-1120

Sami I. S. Havens

Reg. 72572

Patent attorney

Taylor Made Golf Company, Inc.

Carlsbad, CA · 92008

661-900-3219

Thomas Bardwell Haverstock

Reg. 32571

Patent attorney

Haverstock and Owens LLP

Sunnyvale, CA · 94086

408-530-9700

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.