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 Munger, Tolles & Olson LLP, Law Offices of Roger S Gaither, and Life Technologies Corporation.

Top cities in California

All practitioners in California

James B. Gaffney· III

Reg. 74275

Patent attorney

San Jose, CA · 95126

707-217-5604

Susannah Melanie Lynn Gagnon

Reg. 800118

Limited recognition

Munger, Tolles & Olson LLP

San Francisco, CA · 94105

415-512-4098

Roger S Gaither

Reg. 27273

Patent attorney

Law Offices of Roger S Gaither

San Ramon, CA · 94583

925-829-5577

Nadia Galash

Reg. 71460

Patent attorney

San Diego, CA · 92127

858-776-9177

Kevin C. Gale

Reg. 76547

Patent attorney

Life Technologies Corporation

Carlsbad, CA · 92008

484-981-0703

Jennifer J Galela

Reg. 74501

Patent attorney

Haley Guiliano LLP

San Jose, CA · 95113

669-213-1083

Dennis R Gallagher

Reg. 42563

Patent attorney

Haynes and Boone, LLP

Costa Mesa, CA · 92626

949-202-3079

Laura L Gallagher

Reg. 52222

Patent agent

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-242-4211

Mark J Gallagher

Reg. 43622

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Peter A Gallagher

Reg. 47584

Patent attorney

Vierra Magen Marcus LLP

San Francisco, CA · 94105

415-489-4130

Thomas Allen Gallagher

Reg. 24815

Patent agent

Santa Barbara, CA · 93160

415-989-5430

Megan M Gallant

Reg. 65960

Patent attorney

Aikin & Gallant LLP

los altos, CA · 94022

415-505-2671

Michelle S Gallardo

Reg. 66265

Patent agent

Chula Vista, CA · 91915

858-401-2670

Anne-Marie L Gallegos

Reg. 67502

Patent agent

San Jose, CA · 95125

408-506-7833

Hector G Gallegos

Reg. 40614

Patent attorney

Morrison & Foerster LLP

Los Angeles, CA · 90013

213-892-5200

Mavis S Gallenson

Reg. 32464

Patent attorney

Ladas and Parry

Los Angeles, CA · 90036

323-934-2300

William S Galliani

Reg. 33885

Patent attorney

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5622

Nicholas Folino Gallo

Reg. 50135

Patent attorney

Chevron Corporation

San Ramon, CA · 94583-2324

925-842-6407

Francis Vincent Gallucci· Jr.

Reg. 79134

Patent agent

CIONCA IP Law, P.C.

Irvine, CA · 92614

949-334-3036

Karen Kirk Galoyan

Reg. 79135

Patent attorney

Phil IP Law

Pasadena, CA · 91101

818-858-2929

James R. Gambale· Jr.

Reg. 66052

Patent attorney

Encinitas, CA · 92024

858-212-5046

Brandy E. Gamblin

Reg. 80411

Patent agent

Fish and Richardson, P.C.

San Diego, CA · 92130-2245

858-847-4138

Jeffrey S Gananian

Reg. 33696

Patent attorney

Menlo Park, CA · 94025

650-576-9500

Vipul C Gandhi

Reg. 55197

Patent agent

Oxford Semiconductor

Irvine, CA · 92618

949-727-2020

Krithiga Ganesan

Reg. 75528

Patent agent

Apple Inc.

Cupertino, CA · 95014

669-218-3077

Eric Gani

Reg. 64936

Patent agent

Rancho Cucamonga, CA · 91730

909-529-0826

Peter Ganjian

Reg. 43991

Patent agent

PATENT LAW AGENCY, LLC

MONTROSE, CA · 91020-1626

818-248-1465

Catherine X. Gao

Reg. 83012

Patent agent

NVIDIA Corporation

Santa Clara, CA · 95051

408-486-2000

Chuan Gao

Reg. 54111

Patent attorney

KILPATRICK TOWNSEND & STOCKRON, LLP

San Francisco, CA · 94111

415-576-0200

Hua Gao

Reg. 40414

Patent agent

IP Voyage Consulting LLC

Sacramento, CA · 95816

510-270-7087

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.