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 Qualcomm, The Firenza Group Ltd LLC, and Oracle Corporation.

Top cities in California

All practitioners in California

Kevin E. Kantharia

Reg. 71071

Patent attorney

Qualcomm

San Diego, CA · 92121

858-587-1121

Sharon Rosalie Kantor

Reg. 34100

Patent attorney

The Firenza Group Ltd LLC

Danville, CA · 94506

925-648-1221

Kim Kanzaki

Reg. 37652

Patent attorney

Oracle Corporation

Redwood Shores, CA · 94065

650-506-0230

Alisa S Kao

Reg. 64525

Patent attorney

Google Inc.

Mountain View, CA · 94043

415-236-2386

Brian Kao

Reg. 73790

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

212-596-9330

Chris Kao

Reg. 67664

Patent attorney

Kao & Swope LLP

San Francisco, CA · 94104

415-539-0996

Dah-Bin Kao

Reg. 53092

Patent agent

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-324-6388

David C Kao

Reg. 68235

Patent attorney

Covina, CA · 91724-3681

650-305-9832

Milan S Kapadia

Reg. 55982

Patent attorney

Palo Alto Networks

Santa Clara, CA · 95054

949-922-7174

Cindy S Kaplan

Reg. 40043

Patent attorney

San Diego, CA · 92198

408-348-3826

Jonathan M Kaplan

Reg. 46819

Patent attorney

Kaplan IP Law

Scotts Valley, CA · 95067

831-440-7282

Miriam R Kaplan

Reg. 55315

Patent agent

Mirian Kaplan

San Carlos, CA · 94070

415-310-9168

Rahul Kapoor

Reg. 44180

Patent attorney

Morgan, Lewis & Bockius LLP

Palo Alto, CA · 94306

650-843-7580

Sidharth Kapoor

Reg. 68159

Patent attorney

Pierson Ferdinand LLP

Palo Alto, CA · 94303

650-702-9700

Ararat Kapouytian

Reg. 40044

Patent attorney

Maschoff Brennan

San Francisco, CA · 94111

415-738-6369

Alexander Kappner

Reg. 81630

Patent attorney

DO & CO Los Angeles, Inc.

Redondo Beach, CA · 90278

310-800-7121

Rajit Kapur

Reg. 65766

Patent attorney

Maplebear Inc. d/b/a Instacart

San Francisco, CA · 94105

650-549-7334

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

Elliot H. Karlin

Reg. 72946

Patent attorney

North Hollywood, CA · 91605

818-970-3068

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.