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 Medarex, Inc., Amgen, Inc., and Kareht Consulting.

Top cities in California

All practitioners in California

Catherine J Kara

Reg. 41106

Patent agent

Medarex, Inc.

Milpitas, CA · 95035

408-545-2723

Melissa Elizabeth Karabinis

Reg. 51860

Patent agent

Amgen, Inc.

South San Francisco, CA · 94080

773-972-5802

Jack E Karapetian

Reg. 84289

Patent agent

Huntington Beach, CA · 92648

714-616-1649

Lisa A Karczewski

Reg. 53096

Patent attorney

Woodland Hills, CA · 91367

310-319-0397

Katrin M Kareht

Reg. 60515

Patent agent

Kareht Consulting

Palo Alto, CA · 94306

650-533-5613

Eric K Karich

Reg. 41503

Patent attorney

Law Offices of Eric Karich

Irvine, CA · 92612

800-949-0255

Jacob F Karim

Reg. 79326

Patent attorney

San Francisco, CA · 94104

415-772-7423

Marc A Karish

Reg. 44816

Patent attorney

Karish & Bjorgum, PC

Pasadena, CA · 91101

213-785-8070

Justin D Karjala

Reg. 43704

Patent agent

Quest Diagnostics

El Cerrito, CA · 94530

510-749-4224

Aashish R Karkhanis

Reg. 62572

Patent attorney

RPX Corporation

San Francisco, CA · 94105

415-852-3163

Marjan Karkooti

Reg. 70545

Patent agent

Align Technology

San Jose, CA · 95134

408-718-8949

Jeannie Karl

Reg. 65379

Patent attorney

Redwood City, CA · 94061

650-474-2011

Christopher D. Karlen

Reg. 66486

Patent attorney

MiniMed

Northridge, CA · 91325

176-352-68117

Elliot H. Karlin

Reg. 72946

Patent attorney

North Hollywood, CA · 91605

818-970-3068

Rackham H. Karlsson

Reg. 77609

Patent attorney

Invoke IP

Danvill, CA · 94526

408-320-7809

Michael Patrick Karns

Reg. 84100

Patent agent

Irvine, CA · 92612

720-785-4622

Matthew L Karpinski

Reg. 57850

Patent attorney

Buchanan Ingersoll & Rooney LLP

Redwood Shores, CA · 94065-1418

650-622-2340

Satheesh K. Karra

Reg. 40246

Patent attorney

Qualcomm

San Diego, CA · 92122

703-598-5272

Adil Karrar

Reg. 62229

Patent agent

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Brian William Kasell

Reg. 33522

Patent attorney

Venice, CA · 90291

310-399-0567

Matthew R Kaser

Reg. 44817

Patent agent

Castro Valley, CA · 94546

510-727-9123

Erica A. Kashani

Reg. 81472

Patent attorney

Procopio, Cory, Hargreaves & Savitch LLP

San Diego, CA · 92101

619-238-1900

Richard L Kashdan

Reg. 41884

Patent attorney

San Francisco, CA · 94102

415-621-4080

Mohammed Y. Kashef

Reg. 60762

Patent attorney

IBM Corporation

San Francisco, CA · 94105

415-545-2022

Ryan D Kashfian

Reg. 66788

Patent attorney

Kashfian & Kashfian, LLP

Los Angeles, CA · 90067

310-751-7578

Paul Timothy Kashimba

Reg. 29180

Patent attorney

Clovis, CA · 93619

Tristan C. Kaskoun

Reg. 81721

Patent attorney

Los Angeles, CA · 90025

858-336-0572

Kenneth Milton Kaslow

Reg. 32246

Patent attorney

Gard & Kaslow LLP

Los Altos, CA · 94022

650-305-3050

Robert Edward Kasody

Reg. 50268

Patent attorney

Costa Mesa, CA · 92627

714-254-5082

Danielle M Kassatly

Reg. 77343

Patent attorney

San Jose, CA · 95120

408-410-8349

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.