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 DTS, Inc., Law Offices Of Morland C Fischer, and Nano Precision Medical.

Top cities in California

All practitioners in California

Craig S Fischer

Reg. 42535

Patent attorney

DTS, Inc.

Calabasas, CA · 91302

818-436-1338

Morland C Fischer

Reg. 26881

Patent attorney

Law Offices Of Morland C Fischer

Irvine, CA · 92614

949-476-0600

William G. M. Fischer

Reg. 74827

Patent agent

Nano Precision Medical

Emeryville, CA · 94608

510-863-4724

Kirsten M Fish

Reg. 45713

Patent attorney

Needham Davis Kirwan and Young, LLP

San Jose, CA · 95126

408-261-4226

Robert D Fish

Reg. 33880

Patent attorney

Fish & Associates, PC

Irvine, CA · 92649

949-943-8300

Ronald C Fish

Reg. 28843

Patent attorney

Los Gatos, CA · 95031

408-836-3642

Carlos A Fisher

Reg. 36510

Patent attorney

Stout Uxa Buyan & Mullins LLP

Irvine, CA · 92618

949-450-1750

Christopher M Fisher

Reg. 46701

Patent attorney

San Diego, CA · 92108

619-528-8110

Gerald M Fisher

Reg. 24599

Patent attorney

Palo Alto, CA · 94301

650-329-9293

Wendy Jo Fisher

Reg. 69521

Patent attorney

San Francisco, CA · 94110

415-728-7730

Grace Fisher-Adams

Reg. 48759

Patent attorney

Director of Research Compliance,California Institute of Technology

Pasadena, CA · 91125

626-395-2907

Bella Fishman

Reg. 37485

Patent agent

Molecular Devices, LLC

Sunnyvale, CA · 94089

408-747-3508

Deborah E Fishman

Reg. 48621

Patent attorney

DicksteinShapiro LLP

Palo Alto, CA · 94304

650-690-9500

Katherine A. Fisk

Reg. 76317

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2391

Gabriel Fitch

Reg. 62905

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

626-737-0330

Thomas Fitting

Reg. 34163

Patent attorney

The Scripps Research Institute

La Jolla, CA · 92037

858-784-2937

Renee Ann Fitts

Reg. 35136

Patent attorney

Half Moon Bay, CA · 94019

609-439-3237

Matthew J Fitz

Reg. 56352

Patent agent

Encinitas, CA · 92024

760-479-1817

Brian M Fitzgerald

Reg. 63373

Patent attorney

Broadview IP Law, PC

Irvine, CA · 92618

949-232-0721

Sean M Fitzgerald

Reg. 42537

Patent attorney

San Mateo, CA · 94403

650-430-1717

Henry P. FitzGerald

Reg. 84182

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

206-405-2039

Todd E Fitzsimmons

Reg. 44683

Patent attorney

Fitzsimmons IP Law

Gardena, CA · 90248

213-500-1178

Timothy William Fitzwilliam

Reg. 46439

Patent attorney

Lewis Kohn & Fitzwilliam LLP

San Diego, CA · 92130

858-436-1332

Brian N Fiumara

Reg. 80815

Patent agent

San Diego, CA · 92101

702-467-2198

Ryan J. Flaherty

Reg. 75240

Patent agent

Twelve Benefit Corporation

Berkeley, CA · 94710

734-507-0109

Sean D Flaherty

Reg. 67325

Patent attorney

Gordon & Rees, LLP

San Diego, CA · 92101

619-230-7473

Terrence M Flaherty

Reg. 64022

Patent agent

Chevron Corporation

Richmond, CA · 94802

510-242-2489

Daniel L Flamm

Reg. 54100

Patent attorney

Microtechnology Law and Analyis

Walnut Creek, CA · 94596-5459

925-826-3113

Darrin M. Flanigan

Reg. 79719

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-528-0835

Michael G Flanigan

Reg. 69805

Patent attorney

Infineon Technologies LLC

San Jose, CA · 95134

650-418-1067

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.