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 University of California, HelixIP LLP, and Invitrogen Corporation.

Top cities in California

All practitioners in California

Abhay Mohan Kulkarni

Reg. 66017

Patent attorney

Irvine, CA · 92620

323-934-2300

Rashmi Kulkarni

Reg. 70990

Patent agent

Menlo Park, CA · 94025

408-219-5685

Sunil R Kulkarni

Reg. 43731

Patent attorney

University of California

Oakland, CA · 94607

510-987-9800

Andrew A Kumamoto

Reg. 40690

Patent attorney

HelixIP LLP

San Carlos, CA · 94070

650-517-3101

Don F Kumamoto

Reg. 41917

Patent attorney

Sunnyvale, CA · 94087

408-393-5486

Abhay Kumar

Reg. 52536

Patent agent

Invitrogen Corporation

Carlsbad, CA · 92008

760-476-6198

Edwin A Kumar

Reg. 70262

Patent agent

San Bruno, CA · 94066

415-713-9559

Rachana A Kumar

Reg. 79594

Patent agent

San Jose, CA · 95130

206-902-7376

Rakhi Kumar

Reg. 78429

Patent agent

Laguna Hills, CA · 92653

949-705-8757

Ken D Kumayama

Reg. 72586

Patent attorney

Skadden, Arps, Slate, Meagher and Flom LLP

Palo Alto, CA · 94301

650-470-4553

Hari P Kunamneni

Reg. 62073

Patent agent

Cupertino, CA · 95014

408-417-0783

Johnson K. Kuncheria

Reg. 69093

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

650-335-4919

Douglas Andrew Kundrat

Reg. 30275

Patent attorney

Mountain View, CA · 94040

650-515-1810

Stephen Michael Ian Kunen

Reg. 69432

Patent attorney

Palo Alto Networks, Inc.

Santa Clara, CA · 95054

917-575-7598

Simon F Kung

Reg. 68241

Patent attorney

ArentFox Schiff LLP

San Francisco, CA · 94104

415-757-5910

Viola T Kung

Reg. 41131

Patent attorney

Perkins Coie LLP

Palo Alto, CA · 94304

650-838-4457

Benjamin Ping-Lun Kuo

Reg. 66207

Patent attorney

Arcadia, CA · 91066

213-290-2586

Chao-Ling Kuo

Reg. 71256

Patent agent

Cerritos, CA · 90703

646-673-0473

Chiaoyun Kuo

Reg. 53164

Patent agent

Chiaoyun Kuo

Irvine, CA · 92603

949-725-7954

Jung-Hua Kuo

Reg. 41918

Patent attorney

Law Office of Jung-hua Kuo

Los Altos, CA · 94024

650-988-8070

Paul Kuo

Reg. 69433

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-8777

Samantha PS Kuo

Reg. 81484

Patent attorney

Maschoff Brennan Gilmore Israelson & Mauriel

Irvine, CA · 92618

949-889-1674

Charu Shashikumar Kurani

Reg. 62913

Patent attorney

Facebook

Menlo Park, CA · 94025

650-546-1405

Jeffrey R Kurin

Reg. 41132

Patent attorney

Vierra Magen Marcus LLP

San Francisco, CA · 94105

415-489-4100

James Frederick Kurkowski

Reg. 35923

Patent attorney

Half Moon Bay, CA · 94019

650-533-6181

Babak Kusha

Reg. 51095

Patent agent

Townsend and Townsend and Crew LLP

Walnut Creek, CA · 94596

925-472-5006

Maxwell N. Kushner-Lenhoff

Reg. 75201

Patent agent

Long Beach, CA · 90807

323-829-0436

Carl Kustin· Jr

Reg. 24106

Patent attorney

Los Angeles, CA · 90004

323-938-6894

Karen L Kutash

Reg. 54415

Patent attorney

Sherman Oaks, CA · 91411

Bruce D Kuyper

Reg. 33937

Patent attorney

Ruttenberg IP Law, A Professional Corporation

Los Angeles, CA · 90067-2321

310-627-2277

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.