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 Wilson Sonsini Goodrich & Rosati, CooperVision, and Hoofe IP Law PC.

Top cities in California

All practitioners in California

Ye Hong

Reg. 58248

Patent agent

CooperVision

Pleasanton, CA · 94588

925-251-6603

William J Hoofe· IV

Reg. 54183

Patent attorney

Hoofe IP Law PC

Newport Beach, CA · 92662

949-402-8542

Gregory Ross Hook

Reg. 38701

Patent attorney

American Life Science Pharmaceuticals

La Jolla, CA · 92037

858-373-8846

Christina Hoong

Reg. 77769

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2206

Matthew Raymond Hooper

Reg. 31108

Patent attorney

Coherus Biosciences, Inc.

Redwood City, CA · 94065

408-314-7270

George W Hoover· II

Reg. 32992

Patent attorney

Blakely Sokoloff Taylor and Zafman

Los Angeles, CA · 90025

310-207-3800

Russell B. Hoover

Reg. 79088

Patent attorney

Irell & Manella LLP

Newport Beach, CA · 92660

949-760-0991

Daniel P. Hopen

Reg. 35547

Patent attorney

Venture Pacific Law

Mountain View, CA · 94043

650-799-8358

Gregory A Hopewell

Reg. 66012

Patent attorney

Hopewell IP, P.C.

San Jose, CA · 95125

669-292-3015

Brian P Hopkins

Reg. 42669

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

212-970-5913

Mark H Hopkins

Reg. 44775

Patent attorney

Oakland, CA · 94618

510-610-0121

Julie A Hopper

Reg. 50869

Patent attorney

Ionis Pharmaceuticals

Carlsbad, CA · 92010

760-603-2586

Ralph Frederick Hoppin

Reg. 38494

Patent attorney

Schwabe, Williamson & Wyatt

Mountain View, CA · 94043

650-396-1408

Christopher J Horgan

Reg. 40394

Patent attorney

Concert Technology

San Jose, CA · 95126

408-687-8306

Mayuko Horimoto

Reg. 66721

Patent attorney

Santa Clara, CA · 95056-5982

408-781-3740

Jennifer L. Horn

Reg. 66511

Patent attorney

Nomis Solutions

San Bruno, CA · 94066

650-588-9800 X248

Margaret Ann Horn

Reg. 33401

Patent attorney

Pro Lynx LLC

San Francisco, CA · 94158

415-552-5306

Thomas C. Horn

Reg. 81859

Patent attorney

Redwood City, CA · 94063

650-752-2011

Robert David Hornbaker

Reg. 19965

Patent attorney

Freilich Hornbaker and Rosen

Los Angeles, CA · 90024

310-477-0578

Angela Pearl Horne

Reg. 41079

Patent agent

Alameda, CA · 94501-1048

510-523-5489

Thomas E Hornish

Reg. 55277

Patent attorney

Wilson Sonsini Goodrich & Rosati

SAN DIEGO, CA · 92130

858-350-2300

Paul Henry Horstmann

Reg. 36167

Patent attorney

Manhattan Beach, CA · 90266

323-605-4717

Corwin Ray Horton

Reg. 19871

Patent attorney

Kentfield, CA · 94904

415-453-5443

Owen G Hosseinzadeh

Reg. 77815

Patent attorney

Morrison Foerster

San Diego, CA · 92130-3014

858-720-5100

Wayne S Hossenlopp

Reg. 55278

Patent attorney

Campbell, CA · 95008

408-483-4383

Emily C Hostage

Reg. 69717

Patent attorney

Palo Alto, CA · 94301

617-692-0444

Michael J Hostetler

Reg. 47664

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2306

Timothy A. Hott

Reg. 67740

Patent attorney

Guardant Health, Inc

Redwood City, CA · 94063

765-860-2617

Amber R Hottes

Reg. 61488

Patent attorney

Lincoln, CA · 95648

530-601-0021

Tianjun Hou

Reg. 51821

Patent attorney

Houst Consulting

San Jose, CA · 95170

408-921-6160

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.