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 Dickinson Wright RLLP, Dytran Instruments, Inc., and Rutan & Tucker, LLP.

Top cities in California

All practitioners in California

Michael J Ferrazano

Reg. 44105

Patent attorney

Dickinson Wright RLLP

Sunnyvale, CA · 94086

408-701-6200

Pablo E Ferreiro Garcia

Reg. 63454

Patent agent

Dytran Instruments, Inc.

Chatsworth, CA · 91311

818-478-0660

John S Ferrell

Reg. 34593

Patent attorney

SAN MATEO, CA · 94402

650-906-6926

Chelse Ann Ferrero

Reg. 59966

Patent attorney

San Jose, CA · 95135

408-717-8405

Thomas S Ferrill

Reg. 42532

Patent attorney

Rutan & Tucker, LLP

Palo Alto, CA · 94306

650-320-1508

Jason D Ferrone

Reg. 52887

Patent attorney

Isis Pharmaceuticals, Inc.

Carlsbad, CA · 92010

760-603-4631

Matthew A Ferry

Reg. 63142

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130

858-720-5100

Martin Fessenmaier

Reg. 46697

Patent agent

Umberg Zipser LLP

Irvine, CA · 92614

949-679-0052

Ilan B Feuchtwang

Reg. 70098

Patent attorney

Intel Corporation

Santa Clara, CA · 95054

408-765-3881

Jonathan D Feuchtwang

Reg. 41017

Patent attorney

San Carlos, CA · 94070

650-850-1253

Richard M Feustel

Reg. 46698

Patent attorney

Redwood City, CA · 94061

917-714-6348

Bryan J. Fibel

Reg. 63795

Patent agent

Carlsbad, CA · 92008

858-997-5056

Suzanne A Fidler

Reg. 56350

Patent attorney

Irvine, CA · 92623-5415

949-631-0055

Julie L Fieber

Reg. 55175

Patent attorney

Cotchett, Pitre & McCarthy, LLP

Burlingame, CA · 94010

650-697-6000

Bret E Field

Reg. 37620

Patent attorney

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Christopher S. Field

Reg. 58748

Patent attorney

Orrick, Herrington & Sutcliffe, LLP

Menlo Park, CA · 94025

650-614-7391

Kevin G. Fields

Reg. 58040

Patent agent

The Boeing Company

Seal Beach, CA · 90740-1515

562-797-9015

Lori M Fields

Reg. 56351

Patent attorney

Davis Polk & Wardwell

Menlo Park, CA · 94025

650-752-2036

Laura K. Figel

Reg. 78469

Patent attorney

First Republic Bank

San Francisco, CA · 94111

626-399-3990

Eric V Figueroa

Reg. 64712

Patent attorney

ArentFox Schiff

Los Angeles, CA · 90071

213-443-7543

John Alexander Figueroa

Reg. 52890

Patent agent

EFIG.COM, INC.

Los Altos, CA · 94024

408-425-0118

Andrew L Filler

Reg. 44107

Patent attorney

Nanosys, Inc.

Palo Alto, CA · 94304

650-331-2176

Joseph Michael Findley

Reg. 71139

Patent attorney

Samsung Semiconductor, Inc.

San Jose, CA · 95134

408-544-4251

Isaac M. Fine

Reg. 74274

Patent attorney

KPPB, LLP

Anaheim, CA · 92806

949-852-0000

Evan Finkel

Reg. 49059

Patent attorney

Pillsbury Winthrop Shaw Pittman LLP

Los Angeles, CA · 90017-5406

213-488-7307

Robert L Finkel

Reg. 19601

Patent attorney

Robert Louis Finkel

Lake Balboa, CA · 91406

818-786-9861

Don Finkelstein

Reg. 20068

Patent attorney

Law Offices of Don Finkelstein

Torrance, CA · 90503

310-543-0070

Andrew K Finn

Reg. 54097

Patent attorney

Guardant Health, Inc.

Redwood City, CA · 94063

650-274-2535

Jeffrey A Finn

Reg. 51679

Patent attorney

Finn IP Law, PC

Los Angeles, CA · 90064

310-310-7989

Lawrence M. Firestone

Reg. 75217

Patent agent

San Diego, CA · 92127

858-774-0702

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.