California

Patent attorneys in California

California hosts 9,567 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, Illumina, Inc., and Law Offices of Roy A. Ekstrand.

Top cities in California

All practitioners in California

Roy A Ekstrand

Reg. 27485

Patent agent

Law Offices of Roy A. Ekstrand

Costa Mesa, CA · 92626

714-662-7733

Kristine U Ekwueme

Reg. 56344

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121-1714

858-658-1901

Jamal El Yazal

Reg. 55148

Patent agent

Laguna Beach, CA · 92651

949-497-9246

Yasser M El-Gamal

Reg. 45339

Patent attorney

Manatt, Phelps & Phillips, LLP

Cosa Mesa, CA · 92626

714-371-2500

Hazem Elabbadi

Reg. 61669

Patent agent

Sony Corporation of America

San Diego, CA · 92127

858-942-3199

James J Elacqua

Reg. 28412

Patent attorney

Redwood City, CA · 94062

650-533-4342

Samir Elamrani

Reg. 43601

Patent attorney

Wilson Sonsini Goodrich and Rosati

San Diego, CA · 92130

858-350-2337

Selena M. Elansari

Reg. 62030

Patent attorney

Selena Elansari Law Office

Huntington Beach, CA · 92647

714-399-6767

Randall D Elder

Reg. 57716

Patent attorney

Union City, CA · 94587

510-493-8110

Mary M. H. Eliason

Reg. 58303

Patent attorney

Mary Hess Eliason Law

San Diego, CA · 92122

619-991-7623

Michael S Elkind

Reg. 28710

Patent attorney

Studio City, CA · 91604

818-505-3595

Madeline Hyde Elkins

Reg. 77194

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3301

Ernest L Ellenberger

Reg. 56529

Patent agent

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Martin R Ellinger

Reg. 80779

Patent agent

Crinetics Pharmaceuticals

San Diego, CA · 92121

858-214-2993

Steven R Ellinwood

Reg. 48495

Patent attorney

Chevron Corporation

San Ramon, CA · 94583-2324

925-842-1471

Emilie Kate Elliott

Reg. 55465

Patent attorney

Carmel & Naccasha, LLP

San Luis Obispo, CA · 93401

805-546-8785

Janet Ruth Elliott

Reg. 33594

Patent agent

La Jolla, CA · 92037

858-245-3972

Ryan W. Elliott

Reg. 60156

Patent attorney

Nicholson De Vos Webster & Elliott LLP

San Jose, CA · 95113

140-867-50443

Jean S Ellis

Reg. 36505

Patent agent

Illumina, Inc.

San Diego, CA · 92122

858-736-3811

Timothy N Ellis

Reg. 41734

Patent attorney

La Jolla, CA · 92037

Cory T Ellison

Reg. 72195

Patent agent

Morrison & Foerster, LLP

San Francisco, CA · 94105

415-268-7452

Adam C Ellsworth

Reg. 55152

Patent agent

Invoke IP

San Jose, CA · 95113

240-252-0014

Christopher J Ellsworth

Reg. 62797

Patent attorney

Illumina, Inc.

San Diego, CA · 92122

858-246-9958

Michael C Elmer

Reg. 25857

Patent attorney

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304-1203

650-849-6600

Kristen L. Elofson

Reg. 81036

Patent agent

Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.

San Francisco, CA · 94104

141-569-65405

John Elsevier

Reg. 44668

Patent attorney

Jones Day

San Diego, CA · 92121

858-314-1200

Sarah L Elson

Reg. 50360

Patent agent

California Institute for Quantitative Biosciences (QB3)

San Francisco, CA · 94158-2330

415-514-9765

Vera M Elson

Reg. 38030

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304-1050

650-493-9300

Amy J. Embert

Reg. 58822

Patent attorney

Resonance IP Law, PC

Laguna Beach, CA · 92651

408-637-1330

David T Emerson

Reg. 34326

Patent attorney

Berkeley, CA · 94705

510-540-8495

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?

9,567 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.