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 Wilson Sonsini Goodrich & Rosati, Morrison Foerster, and Guardant Health, Inc.

Top cities in California

All practitioners in California

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

Ryan D Houck

Reg. 72336

Patent attorney

Kirkland & Ellis LLP

Los Angeles, CA · 90071

213-680-8174

Deena L Hougham

Reg. 47665

Patent attorney

Garden Grove, CA · 92842

714-636-0833

Elizabeth J Hoult

Reg. 46781

Patent attorney

Howrey LLP

Irvine, CA · 92614

949-721-6900

Sabrina I Houston

Reg. 68908

Patent agent

Laguna Beach, CA · 92651

202-251-0718

Norman T Hovijitra

Reg. 65119

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-493-9300

Damien J Howard

Reg. 70256

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Elise Diamond Howard

Reg. 67219

Patent agent

Laguna Niguel, CA · 92677

310-489-4860

Elizabeth A Howard

Reg. 40356

Patent attorney

Orrick Herrington and Sutcliffe, LLP

Menlo Park, CA · 94025

650-614-7400

Emily D. Howard

Reg. 82156

Patent agent

Morrison and Foerster

Los Angeles, CA · 90017

213-269-7512

Kelvan Patrick Howard

Reg. 48999

Patent attorney

San Francisco, CA · 94117

510-435-0635

Linda S Howard

Reg. 48853

Patent attorney

Linda S. Howard, RPH, Attorney at Law

Orinda, CA · 94563

925-212-5700

MarySusan Howard

Reg. 38729

Patent agent

Geomatica, Inc.

San Diego, CA · 92121

858-210-4433

Wayne R. Howe

Reg. 74162

Patent agent

Boeing

Irvine, CA · 92612

949-422-5325

John Martin Howell

Reg. 33713

Patent attorney

Napa, CA · 94559

707-666-2259

Thomas Craig Howerton

Reg. 48650

Patent attorney

Medlen & Carroll, LLP

Oakland, CA · 94612

781-848-4020

Patricia M Hoyle

Reg. 54187

Patent attorney

Sweegen, Inc.

Rancho Santa Margarita, CA · 92688

949-317-6875

Charles Frank Hoyng

Reg. 35548

Patent attorney

Latham & Watkins LLP

Menlo Park, CA · 94025

650-328-4600

Petrina Sze-Wai Hsi

Reg. 38496

Patent attorney

Amgen, Inc.

Thousand Oaks, CA · 91320

805-447-8631

David C Hsia

Reg. 46235

Patent attorney

Patent Law Group LLP

Sunnyvale, CA · 94088

650-965-8005206

Kyna K. Hsiao

Reg. 66482

Patent attorney

Dublin, CA · 94568

510-541-2101

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.