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 Wilson Sonsini Goodrich & Rosati, Venable LLP, and Lewis Brisbois Bisgaard & Smith LLP.

Top cities in California

All practitioners in California

Margaret Brooks

Reg. 47448

Patent agent

Martinez, CA · 94553

925-335-2772

Michael A Brooks

Reg. 56725

Patent attorney

Pomona, CA · 91766

206-718-0847

Sarah S Brooks

Reg. 57071

Patent attorney

Venable LLP

Los Angeles, CA · 90067

310-229-9900

Josephine Ann U Brosas

Reg. 66679

Patent attorney

Lewis Brisbois Bisgaard & Smith LLP

Los Angeles, CA · 90012

213-250-1800

Douglas P Brosnan

Reg. 54616

Patent agent

Roseville, CA · 95661

Harris F. Brotman

Reg. 35461

Patent attorney

Stemedica Cell Technologies, Inc.

San Diego, CA · 92121

858-658-0910

Jan P Brouard

Reg. 35081

Patent attorney

CooperVision, Inc.

Pleasanton, CA · 94588

925--25-1-6649

Dana L Broughton

Reg. 73686

Patent attorney

Kite Pharma

Santa Monica, CA · 90404

843-209-2885

Brian D. Brown

Reg. 78858

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-880-6733

Charles D Brown

Reg. 28285

Patent attorney

Rancho Palos Verdes, CA · 90275

310-377-7083

Derek T Brown

Reg. 77915

Patent attorney

Mountain View, CA · 94041-1982

919-370-2568

Earl D Brown· Jr

Reg. 44042

Patent attorney

San Mateo, CA · 94403

Eric W. Brown

Reg. 59718

Patent agent

TechnoView IP Inc.

Newport Beach, CA · 92660

949-629-2522

Jonathan W. Brown

Reg. 76466

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3058

Julie W. Brown

Reg. 72840

Patent agent

Los Alamitos, CA · 90720

562-260-3385

Kyle A. Brown

Reg. 58070

Patent agent

KILPATRICK TOWNSEND AND STOCKTON

San Diego, CA · 92110

619-788-3152

Marc E Brown

Reg. 28590

Patent attorney

Los Angeles, CA · 90067-3208

818-986-4998

Rebecca A Brown

Reg. 47452

Patent attorney

Applied Materials

Santa Clara, CA · 95054-3299

669-318-9817

Renee DuBord Brown

Reg. 42500

Patent attorney

Knowles Electronics

Mountain View, CA · 94043

650-279-9311

Rodney Y Brown

Reg. 30450

Patent attorney

San Diego, CA · 92117

858-272-8705

Roslyn N Brown

Reg. 75740

Patent agent

Cepheid

Sunnyvale, CA · 94089

352-870-1046

Sarah A Brown

Reg. 47455

Patent attorney

Cislo & Thomas LLP

Santa Monica, CA · 90401-4110

310-451-0647

Stewart M Brown

Reg. 65793

Patent attorney

Santa Barbara, CA · 93109

619-981-1963

Theodore G Brown· III

Reg. 31741

Patent attorney

Kilpatrick Townsend & Stockton, LLP

Menlo Park, CA · 94025

650-326-2400

Timothy Martin Brown

Reg. 48069

Patent attorney

TMB Law

San Luis Obispo, CA · 93401

805-591-4609

Tyrome Yang Brown

Reg. 46580

Patent attorney

Dolby Laboratories

Sunnyvale, CA · 94085

408-330-3390

Wayne Benjamin Brown

Reg. 45484

Patent attorney

Quest Diagnostics, Inc.

San Juan Capistrano, CA · 92690

949-728-4747

William R Brown· Jr

Reg. 41645

Patent attorney

Law Offices of William R. Brown

Menlo Park, CA · 94025

650-329-8572

Sharon Elise Brown-Turner

Reg. 64205

Patent attorney

Law Offices of Andrew D. Fortney, Ph.D.P.C.

Fresno, CA · 93711

559-432-6847

Robert S Brownstein

Reg. 68040

Patent agent

Robert Brownstein & Associates

Santa Cruz, CA · 95065

831-818-1278

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.