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 Applied Materials, Inc., DLA Piper LLP (US), and Skiermont Derby LLP.

Top cities in California

All practitioners in California

David Hobum Hwang

Reg. 38697

Patent attorney

Applied Materials, Inc.

Santa Clara, CA · 95054

408-563-4324

Pamela E Hwang

Reg. 54984

Patent attorney

DLA Piper LLP (US)

San Diego, CA · 92121

858-677-1473

Rex Hwang

Reg. 56206

Patent attorney

Skiermont Derby LLP

Los Angeles, CA · 90071

213-788-4500

Susan M Hwang

Reg. 50861

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Los Angeles, CA · 90071

213-620-1780

Timothy H. Hwang

Reg. 61145

Patent attorney

Van Pelt, Yi & James

Cupertino, CA · 95014

408-973-2585

Tina C Hwang

Reg. 58513

Patent attorney

Google Inc.

Mountain View, CA · 94043

Young Ping Hwung

Reg. 44164

Patent attorney

Agilent Technologies, Inc.

Santa Clara, CA · 95051

408-553-3738

Anna M. Hyatt

Reg. 64463

Patent agent

Dren Bio Management, Inc.

San Carlos, CA · 94070

415-737-5277

Nicole E Hyatt

Reg. 63377

Patent agent

San Diego, CA · 92103

503-419-8804

Roger Nicholas Hylton

Reg. 50866

Patent attorney

Townsend and Townsend and Crew LLP

Palo Alto, CA · 94301

650-326-2400

Eric Stuart Hyman

Reg. 30139

Patent attorney

Womble Bond Dickinson LLP

Los Angeles, CA · 90025

310-207-3800

Laurence Jay Hyman

Reg. 35551

Patent attorney

Hyman IP Law

San Francisco, CA · 94133

415-440-3100

Andrei Iancu

Reg. 41862

Patent attorney

Sullivan & Cromwell LLP

Los Angeles, CA · 90067-1725

310-712-6600

Jonathan M Ibasco

Reg. 63628

Patent attorney

Canon U.S.A, Inc.

Irvine, CA · 92618

949-932-3104

Abeer B Ibrahim

Reg. 77223

Patent agent

Lowenstein Sandler LLP

Palo Alto, CA · 94301

650-433-5800

Sabir A Ibrahim

Reg. 64751

Patent attorney

Greenberg Traurig

East Palo Alto, CA · 94303

650--28-9-7824

Ogechi O Ifemembi

Reg. 62691

Patent agent

Cerritos, CA · 90703

Vasily A. Ignatenko

Reg. 74515

Patent attorney

Genentech, INC.

San Francisco, CA · 94080

781-929-2645

Robin V. Ihnfeldt

Reg. 66323

Patent agent

San Diego, CA · 92121

858-736-5069

Geoffrey Y Iida

Reg. 48567

Patent attorney

Knobbe Martens Olson and Bear LLP

Newport Beach, CA · 92660

949-760-0404

Nicole Chyoko Iida

Reg. 48906

Patent attorney

Arena Pharmaceutical, Inc.

San Diego, CA · 92121

858-453-7200

Jon Y Ikegami

Reg. 51115

Patent attorney

Haley Guiliano LLP

San Jose, CA · 95113

669-213-1068

Patrick Y Ikehara

Reg. 42681

Patent attorney

APPLIED MEDICAL RESOURCES CORPORATION

Rancho Santa Margarita, CA · 92688

949-713-8327

Margaret Chu Ikeya

Reg. 43549

Patent attorney

Sunnyvale, CA · 94087

408-245-9593

Gary R Ilmanen

Reg. 47673

Patent attorney

The Law Offices of G.R. Ilmanen

Perris, CA · 92570

951-682-6345

Obi I Iloputaife

Reg. 45677

Patent attorney

Cotman IP Law Group, PLC

Pasadena, CA · 91103

626-405-1413

Ahsan G Imam

Reg. 74757

Patent attorney

ResMed

San Diego, CA · 92123

858-836-6634

Maryam Imam

Reg. 38190

Patent attorney

Avalanche Technology

Fremont, CA · 94538

408-858-5666

Annabel M Imbrie-Moore

Reg. 80979

Patent agent

San Francisco, CA · 94107

434-227-2987

Joon Hyuk Imm

Reg. 76689

Patent agent

Belmont, CA · 94002

317-643-1022

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.