California

Patent attorneys in California

California hosts 9,553 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 Elo Touch Solutions, Invoke, and Nektar Therapeutics.

Top cities in California

All practitioners in California

Judy Marie Maher

Reg. 37388

Patent agent

Elo Touch Solutions

Milpitas, CA · 95035

408-597-8712

Kumar K Maheshwari

Reg. 60443

Patent attorney

Irvine, CA · 92618

530-400-9246

Sherif N A Mahmoud

Reg. 71860

Patent attorney

Invoke

Danville, CA · 94526

312-344-3148

Jacqueline F Mahoney

Reg. 48390

Patent attorney

Nektar Therapeutics

San Francisco, CA · 94158

415-482-5300

John W Mahoney

Reg. 44892

Patent attorney

ACT Biotech Inc.

San Francisco, CA · 94103

415--23-0-3904

Hans R Mahr

Reg. 46138

Patent attorney

Sony Corporation of America

San Diego, CA · 92127

858-942-3055

Ronald G Mahurin

Reg. 63069

Patent attorney

Belmont, CA · 94002

650-573-5637

Dat D. Mai

Reg. 83802

Patent agent

San Francisco, CA · 94131

347-717-0023

Jianning Mai

Reg. 68121

Patent agent

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7844

Trieu T. Mai

Reg. 61354

Patent agent

Santa Cruz, CA · 95060

831-427-1338

Clifford A Maier

Reg. 59526

Patent attorney

Campbell, CA · 95008

408-871-7883

Paul H Maier

Reg. 84860

Patent agent

San Francisco, CA · 94122

408-220-5239

Paul T. Main

Reg. 66064

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Justin E Maio

Reg. 74197

Patent attorney

San Diego, CA · 92120

619-933-8151

Lance A Maish

Reg. 53256

Patent attorney

Laguna Niguel, CA · 92677

949-375-6015

Henna Maiwand

Reg. 902316

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

916-276-4012

Thomas Henry Majcher

Reg. 31119

Patent attorney

Fulwider Patton LLP

Los Angeles, CA · 90045

310-824-5555

Arash Majdi

Reg. 74015

Patent agent

Pillsbury Winthrop Shaw Pittman LLP

San Diego, CA · 92130-4088

858-509-4015

Laura A Majerus

Reg. 33417

Patent attorney

San Mateo, CA · 94403

650-906-8839

Martin Frank Majestic

Reg. 25695

Patent attorney

Lafayette, CA · 94549

650-849-6600

Miriam E Majofis

Reg. 32480

Patent attorney

San Mateo, CA · 94402

650-344-7630

Julianna L Major

Reg. 84861

Patent agent

San Jose, CA · 95128

408--66-0-2983

Danton K Mak

Reg. 31695

Patent attorney

Leech Tishman Fuscaldo & Lampl, LLP

Pasadena, CA · 91103-3842

626-796-4000

Evelyn C Mak

Reg. 50492

Patent attorney

SK hynix NAND Product Solutions Corp.

San Jose, CA · 95134

408-219-1807

Kayli S. Mak

Reg. 84215

Patent agent

Temple City, CA · 91780

626-905-0142

Kyoko C Makino

Reg. 72200

Patent agent

Kilpatrick Townsend & Stockton LLP

Los Angeles, CA · 90067

310-966-4940

Rebecca I. Makitalo

Reg. 80120

Patent agent

Cislo & Thomas, LLP

Los Angeles, CA · 90025

310-451-0647

Amit Makker

Reg. 68086

Patent attorney

Oakland, CA · 94610

310-720-2648

Ali Makoui

Reg. 45536

Patent attorney

Makoui Law, PC

Encino, CA · 91436

818-261-5998

David Norman Makous

Reg. 29559

Patent attorney

Pierson Ferdinand LLP

Beverly Hills, CA · 90212

310-974-3224

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?

9,553 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.