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 Invoke IP, Wilson Sonsini Goodrich & Rosati, and Buchanan Ingersoll & Rooney LLP.

Top cities in California

All practitioners in California

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

Jody L. Karol

Reg. 78950

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94105

415-947-2088

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

L. Samuel Anthony Kassatly

Reg. 32247

Patent attorney

San Jose, CA · 95120

408-323-5111

Kristopher B Kastens

Reg. 57517

Patent agent

Herbert Smith Freehills Kramer (US) LLP

Redwood City, CA · 94065

650-752-1700

Kevin Ray Kaster

Reg. 32704

Patent agent

Foster City, CA · 94404

650-573-6718

Courtney S. Kasuboski

Reg. 75443

Patent attorney

Kramer Alberti Lim & Tonkovich

Foster City, CA · 94404

440-829-1171

Irene N. Kasumba

Reg. 80086

Patent agent

WILSON SONSINI GOODRICH & ROSATI

PALO ALTO, CA · 94304-1050

202-920-8749

Abdollah Katbab

Reg. 45325

Patent attorney

ABK Patent Group, Inc.

Del Mar, CA · 92014

858-449-7078

Vinit G Kathardekar

Reg. 39461

Patent attorney

Cupertino, CA · 95014

650-533-7208

Arman Katiraei

Reg. 63098

Patent attorney

Los Angeles Patent Group

Beverly Hills, CA · 90211

424-250-0051

Zakia Kator

Reg. 67509

Patent agent

Corona, CA · 92883

714-469-7733

Olga M. Katsnelson

Reg. 68503

Patent attorney

Lewis Roca Rothgerber Christie LLP

Glendale, CA · 91209-9001

626-795-9900

Charles Bernard Katz

Reg. 36564

Patent attorney

PALO ALTO, CA · 94301

650-248-4448

Gail A Katz

Reg. 53101

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

805-447-9722

Jeffrey N Katz

Reg. 74493

Patent attorney

Upland, CA · 91786

909-294-6529

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.