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 Hueston Hennigan LLP, Volcano Corporation, and Wilmer Cutler Pickering Hale and Dorr LLP.

Top cities in California

All practitioners in California

Thomas B King

Reg. 69721

Patent attorney

Hueston Hennigan LLP

Newport Beach, CA · 92660

949-287-5940

Curtis Durell Kinghorn

Reg. 33926

Patent attorney

Volcano Corporation

San Diego, CA · 92130

858-720-4091

Adam M Kinsey

Reg. 63662

Patent agent

San Diego, CA · 92130

415-310-5240

Jason D Kipnis

Reg. 40680

Patent attorney

Wilmer Cutler Pickering Hale and Dorr LLP

Palo Alto, CA · 94304

650-600-5036

Stefan James Kirchanski

Reg. 36568

Patent attorney

Zuber Lawler & Del Duca LLP

Los Angeles, CA · 90017

213-596-5654

Dimitri Kirimis

Reg. 71487

Patent attorney

Irvine, CA · 92618

949-390-7163

Ashley L Kirk

Reg. 51261

Patent attorney

Willenken, Wilson. Loh and Delgado

Los Angeles, CA · 90017

213-955-9240

Fikret N Kirkbir

Reg. 57947

Patent agent

Studio City, CA · 91604

323-354-2380

Mark D Kirkland

Reg. 40048

Patent attorney

Fish & Richardson P.C.

Redwood City, CA · 94063

650-839-5000

Anita McGowan Kirkpatrick

Reg. 32617

Patent agent

San Diego, CA · 92127

858-451-9769

Sheila R Kirschenbaum

Reg. 44835

Patent attorney

San Diego, CA · 92162-0624

Shrut Kirti

Reg. 77834

Patent attorney

Ropes & Gray LLP

East Palo Alto, CA · 94303

650-671-4749

James David Kiryakoza

Reg. 57049

Patent attorney

Block, Inc.

San Francisco, CA · 94103

415-335-8125

Eugenia Kiselgof

Reg. 65258

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

267-302-9458

Rosemary C Kiser

Reg. 77320

Patent agent

California Institute of Technology

Pasadena, CA · 91125

626-395-4976

Jennifer L Kisko

Reg. 56907

Patent attorney

Scripps Research

La Jolla, CA · 92037

858-784-1000

Jamie H Kitano

Reg. 67510

Patent attorney

Coherus BioSciences, Inc.

Redwood City, CA · 94305

650-649-3522

Margaret A Kivinski

Reg. 38517

Patent attorney

Laguna Niguel, CA · 92677

949-683-6348

Kurt M Kjelland

Reg. 41901

Patent attorney

Qualcomm, Inc.

San Diego, CA · 92121

858-651-5423

N Paul Klaas

Reg. 25733

Patent agent

Oceanside, CA · 92056

760-639-5404

Alan Waldo Klaassen

Reg. 35220

Patent agent

Chevron Corporation

Richmond, CA · 94802

510-242-7232

Tara S. Klamrowski

Reg. 74807

Patent attorney

Santa Monica, CA · 90403

310-570-6058

David M Kleiman

Reg. 42744

Patent attorney

Westlake Village, CA · 91362

310-694-0874

Eden Kleiman

Reg. 84102

Patent agent

Vista, CA · 92081

619-488-0500

Elizabeth Offen-Brown Klein

Reg. 63639

Patent attorney

Albany, CA · 94706

510-526-2122

Esther E Klein

Reg. 34337

Patent attorney

San Carlos, CA · 94070

408-761-0047

Ian M. Klein

Reg. 82746

Patent attorney

Artegis Law Group, LLP

Sunnyvale, CA · 94085

215-850-8240

Jerry Alan Klein

Reg. 35222

Patent agent

The Chatham Group

Los Altos, CA · 94022

650-948-1243

Marlene Klein

Reg. 43718

Patent attorney

Lake Forest, CA · 92630

949-521-4305

Richard Louis Klein

Reg. 33330

Patent attorney

Santa Rosa, CA · 95404

707-484-9214

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.