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 Knobbe, Martens, Olson & Bear, LLP, YHE Law LLP, and Shartsis Friese LLP.

Top cities in California

All practitioners in California

Grace Naomi Martin

Reg. 82403

Patent agent

YHE Law LLP

Lafayette, CA · 94549

415-634-5481

James P Martin

Reg. 47772

Patent attorney

Shartsis Friese LLP

San Francisco, CA · 94111

415-421-6500

Jill Dyan Martin

Reg. 50006

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-922-1414

John Scott Martin

Reg. 72850

Patent attorney

View, Inc.

Alviso, CA · 95002-1180

408-263-9200

Julia A. Martin

Reg. 45817

Patent attorney

Martin Tech Law

Menlo Park, CA · 94025

650-473-0681

Margaret L. Martin

Reg. 84068

Patent agent

Orange, CA · 92869

714-907-7654

Michael F Martin

Reg. 52001

Patent attorney

Workday, Inc.

Pleasanton, CA · 94588

650-352-3416

Neil F Martin

Reg. 23088

Patent attorney

Neil F. Martin and Associates

Menifee, CA · 92584

858-756-6859

Paul R Martin

Reg. 24593

Patent attorney

Martin Law Offices

Fairfield, CA · 94534

707-208-7637

Robert T Martin

Reg. 32426

Patent agent

Gard & Kaslow LLP

Los Altos, CA · 94022

650-305-3050

Robert B Martin

Reg. 26945

Patent attorney

San Jose, CA · 95129

408-446-9455

Roger W Martin

Reg. 39291

Patent agent

NorthCityWest Group, LLC

Del Mar, CA · 92014

858-204-0453

Sarah K. Martin

Reg. 80439

Patent agent

Esconido, CA · 92025

760-520-5336

Jose A. Martin del Campo

Reg. 79610

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-721-5340

Edward T Martindale

Reg. 69725

Patent attorney

Technology Transfer Office

San Diego, CA · 92182-8220

619-594-0791

Peter B Martine

Reg. 32043

Patent attorney

Martine Penilla Group LLP

Sunnyvale, CA · 94085

408-749-6900

Jason R. Martineau

Reg. 61398

Patent attorney

Samsung Semiconductor Inc.

San Jose, CA · 95134

408-544-4283

Joshua Michael Martineau

Reg. 79242

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

212-849-3000

Alexander J Martinez

Reg. 75319

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Cassidy L. Martinez

Reg. 76321

Patent attorney

Rohnert Park, CA · 94928

707-236-0784

Joanne T. Martinez

Reg. 60096

Patent attorney

San Francisco, CA · 94117

850-727-1392

Jose F. Martinez

Reg. 78122

Patent agent

Wilson Sonsini Goodrich and Rosati

Palo Alto, CA · 94304-1050

541-400-0071

Michelle N Martinez

Reg. 68549

Patent attorney

Irvine, CA · 92618

801-455-4837

Peter Raphael Martinez

Reg. 42845

Patent attorney

Law Office of Peter Martinez, Esq.

Woodland Hills, CA · 91367

858-449-0612

Raul D Martinez

Reg. 46904

Patent attorney

GPC Properties, LLC

Santa Monica, CA · 90404

310-592-2015

Sheila P Martinez-Lemke

Reg. 52004

Patent attorney

Kwan & Olynick L LP

Berkeley, CA · 94704

510-900-9501

Nicholas V. Martini

Reg. 69094

Patent attorney

Adobe Systems, Inc.

San Jose, CA · 95113

408-536-6692

Marc G. Martino

Reg. 65695

Patent agent

Westlake Village, CA · 91362

818-825-0988

Ani Martirosian

Reg. 79109

Patent attorney

Glendale, CA · 91202

818-749-1243

Jason C Martone

Reg. 59469

Patent attorney

Lewis Roca Rothgerber Christie LLP

Irvine, CA · 92612

949-476-0757

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.