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 Genentech, Inc., Weaver Austin Villeneuve & Sampson LLP, and Sony Interactive Entertainment LLC.

Top cities in California

All practitioners in California

Julie A Heider

Reg. 54161

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

1-6-50--467-7743

Elise R Heilbrunn

Reg. 42649

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

510-663-1100

Jeffery Scott Heileson

Reg. 46765

Patent attorney

Sony Interactive Entertainment LLC

San Mateo, CA · 94404

650-655-8000

Alan E Heimlich

Reg. 48808

Patent attorney

Heimlich Law

San Jose, CA · 95129

408-646-1921

M Henry Heines

Reg. 28219

Patent attorney

Kilpatrick, Townsend & Stockton, LLP

San Francisco, CA · 94111

415-576-0200

Anna Lynne Heinkel

Reg. 44755

Patent attorney

Law Office of Anna Lynne Heinkel

Campbell, CA · 95008

408-442-6514

David E Heisey

Reg. 42651

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130-3051

858-720-8900

Bradley Paul Heisler

Reg. 35892

Patent attorney

Heisler & Associates

Roseville, CA · 95661

916-781-6634

Warren Stuart Heit

Reg. 36828

Patent attorney

White and Case, LLP

Palo Alto, CA · 94306

650-213-0321

Erica J. Helgerson

Reg. 74255

Patent agent

San Diego, CA · 92121

619-227-0637

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 R. Henderson

Reg. 77606

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

425-503-7202

Andrew H. Henderson

Reg. 79390

Patent agent

Irell & Manella LLP

Los Angeles, CA · 90067

310-203-7131

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

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.