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 Mitchell Silberberg and Knupp LLP, Lewis Brisbois Bisgaard & Smith LLP, and Incyte, Corp..

Top cities in California

All practitioners in California

Frank W Kenniasty

Reg. 46823

Patent attorney

San Carlos, CA · 94070

240-581-4477

Evan Michael Kent

Reg. 30074

Patent attorney

Mitchell Silberberg and Knupp LLP

Los Angeles, CA · 90064

310-312-3111

Jonathan G Kepko

Reg. 70303

Patent attorney

Lewis Brisbois Bisgaard & Smith LLP

San Francisco, CA · 94104

415-438-6646

Lori L Kerber

Reg. 41113

Patent agent

Incyte, Corp.

Palo Alto, CA · 94304

650-845-4894

Kathleen M Kerekes

Reg. 51870

Patent attorney

Kerekes Law Corporation

Sacramento, CA · 95814

916-706-0271

Daniel Howard Kern

Reg. 36841

Patent attorney

Irvine, CA · 92618

949-677-7233

Sara N Kerrane

Reg. 62801

Patent attorney

K&L Gates LLP

Irvine, CA · 92614

949-253-0900

Cameron Kerrigan

Reg. 44826

Patent attorney

Squire Patton Boggs (US) LLP

Palo Alto, CA · 94304

415-954-0323

Charles A Kertell

Reg. 41891

Patent attorney

Lewis, Brisbois, Bisgaard & Smith, LLP

Costa Mesa, CA · 92626

714-966-3141

Mark J Kertz

Reg. 43711

Patent attorney

Medtronic plc

Irvine, CA · 92617

949-680-1313

Irving Keschner

Reg. 24547

Patent attorney

Irving Keschner

Torrance, CA · 90503

310-977-5852

Henrik Keshishian

Reg. 54623

Patent agent

Knobbe Martens

Irvine, CA · 92614

858-707-4013

Milord A Keshishian

Reg. 43333

Patent attorney

Milord & Associates, P.C.

Los Angeles, CA · 90064

310-226-7878

Amanda M. Kesich

Reg. 70667

Patent attorney

Weaver Austin Villeneuve & Sampson

Oakland, CA · 94612-0250

510-663-1100

Jarom D Kesler

Reg. 57046

Patent attorney

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

John J Ketchum

Reg. 61932

Patent attorney

Arent Fox LLP

Los Angeles, CA · 90013

213-988-6683

Hemant H Kewalramani

Reg. 43713

Patent attorney

Anaheim, CA · 92807

714-335-4590

Brian B Kewo

Reg. 68586

Patent agent

Eastvale, CA · 92880

646-450-5396

Daniel A Keys

Reg. 61650

Patent agent

Beckman Coulter

Irvine, CA · 92604-3315

949-551-1066

William J Keyworth

Reg. 47704

Patent agent

Bill & Mary Lou INC

San Francisco, CA · 94111

415-397-8056

David M Keyzer

Reg. 56812

Patent attorney

Law Office of David Keyzer, P.C.

El Dorado Hills, CA · 95762

916-243-5259

William Brian Kezer

Reg. 37369

Patent attorney

Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.

San Francisco, CA · 94104

415-432-6111

Anbar F. Khal

Reg. 59088

Patent attorney

Oakley, Inc.

Foothill Ranch, CA · 92610

949-672-6983

Nusrat Khaleeli

Reg. 61834

Patent attorney

San Jose, CA · 95118

408-774-0593

Omid E. Khalifeh

Reg. 67018

Patent attorney

Omni Legal Group

Los Angeles, CA · 90024

310-276-6664

Abdulahad Khan

Reg. 66925

Patent agent

Dublin, CA · 94568

817-875-2253

Athar A Khan

Reg. 60271

Patent attorney

Law Offices of Athar A. Khan

Irvine, CA · 92618

949-432-6529

Elaine M Khan

Reg. 50235

Patent agent

Mather, CA · 95655

916-366-0511

Karin C. Khan

Reg. 60763

Patent attorney

Newport Beach, CA · 92663

949-258-4388

Sikander M. Khan

Reg. 78888

Patent attorney

Haynes Beffel & Wolfeld, LLP

Half Moon Bay, CA · 94019

650-479-9257

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.