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 The Hellenkamp Law Firm, ViaSat, Inc., and Hellmoldt Law, PC.

Top cities in California

All practitioners in California

Joseph P Helgeson

Reg. 71469

Patent attorney

La Crescenta, CA · 91214

949-205-9751

Olof Krister Hellen

Reg. 49011

Patent attorney

Santa Cruz, CA · 95065

831-425-6563

Amy Stark Hellenkamp

Reg. 38624

Patent agent

The Hellenkamp Law Firm

San Diego, CA · 92130

619-246-5103

John A. Hellmann

Reg. 67952

Patent attorney

ViaSat, Inc.

Carlsbad, CA · 92009

760-893-1492

Dieter H Hellmoldt

Reg. 54162

Patent attorney

Hellmoldt Law, PC

San Francisco, CA · 94107

415-728-1901

Kevin S Helmbacher

Reg. 41062

Patent attorney

Encinitas, CA · 92024

619-884-0606

Aubrey L Helms· Jr

Reg. 56805

Patent agent

Intermolecular, Inc

San Jose, CA · 95134

408-582-5516

Susan E Heminger

Reg. 36449

Patent agent

Apple, Inc.

Cupertino, CA · 95014

408-862-5906

Steven Daniel Hemminger

Reg. 30755

Patent attorney

Alston & Bird LLP

East Palo Alto, CA · 94303-2282

650-838-2000

Andrew H. Henderson

Reg. 79390

Patent agent

Irell & Manella LLP

Los Angeles, CA · 90067

310-203-7131

Andrew R. Henderson

Reg. 77606

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

425-503-7202

Forrest S Henderson

Reg. 55257

Patent attorney

Apple Inc.

Cupertino, CA · 95014

408-974-2043

Lee W Henderson

Reg. 41830

Patent attorney

Knobbe Marten Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Michelle L Henderson

Reg. 42654

Patent attorney

Pranger Law PC

San Francisco, CA · 94105

952-204-9513

Mymy N. Henderson

Reg. 64975

Patent attorney

Ericsson, Inc.

Santa Clara, CA · 95054

650-283-7353

Uleses C Henderson· Jr

Reg. 53013

Patent attorney

Hawthorne, CA · 90250

310-466-5231

Parham Hendifar

Reg. 71470

Patent attorney

Law Office Of Parham Hendifar

Santa Monica, CA · 90405

310-948-3425

Jeffrey L. Hendricks

Reg. 83915

Patent agent

Berkeley, CA · 94708

510-977-1298

Justin A Hendrix

Reg. 64064

Patent attorney

Collins Aerospace

Chula Vista, CA · 91910

619-691-3703

Albert K. Heng

Reg. 71908

Patent agent

Greenberg Traurig LLP

San Diego, CA · 92130

619-848-2502

Michael P Henick

Reg. 83478

Patent agent

Winchester, CA · 92596

619-200-4403

John D Henkhaus

Reg. 42656

Patent attorney

John Henkhaus

San Jose, CA · 95139

408-578-8556

Kevin C. Hennessy

Reg. 81123

Patent agent

Huntington Beach, CA · 92648

714-625-6311

Caitlin L Henning

Reg. 83505

Patent agent

Foley & Lardner LLP

San Francisco, CA · 94104

415-438-6418

Guy P Henry

Reg. 77061

Patent agent

San Diego, CA · 92129

858-334-8410

James A Henry

Reg. 41064

Patent attorney

Anaheim, CA · 92807

714-615-9484

Clayton R Henson

Reg. 75150

Patent attorney

Knobbe, Martens, Olson & Bear LLP

San Diego, CA · 92130

858-707-4000

Paul Marvin Hentzel

Reg. 24602

Patent attorney

Palo Alto, CA · 94301

650-326-8254

Richard J Hepner

Reg. 53016

Patent attorney

HepnerLaw

Mission Viejo, CA · 92692

949-280-4800

Susan E. Hepp

Reg. 78022

Patent agent

Morrison & Foerster LLP

San Francisco, CA · 94105

415-268-6019

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.