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 Cooley LLP, Knobbe Martens Olson and Bear, LLP, and ALUMIT IP.

Top cities in California

All practitioners in California

Daniel E Altman

Reg. 34115

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

John Valentino A Alumit

Reg. 62690

Patent attorney

ALUMIT IP

Glendale, CA · 91205-4917

818-244-4861

Celeste M. Alvarez

Reg. 79296

Patent agent

Cooley LLP

San Diego, CA · 92121

858-550-6000

Ciara Alvarez-Malo

Reg. 79071

Patent agent

Greenberg Traurig

Irvine, CA · 92612

310-985-1049

Anthony S. Alzona

Reg. 74625

Patent agent

Canon USA Inc.

Irvine, CA · 92618

949-932-3242

Eric Amador

Reg. 42260

Patent agent

San Carlos, CA · 94070

650-637-9479

Houtan Amanat

Reg. 61506

Patent agent

KILPATRICK TOWNSEND & STOCKTON LLP

Walnut Creek, CA · 94596

925-472-5000

Duke K Amaniampong

Reg. 45806

Patent attorney

Duke & Associates

San Francisco, CA · 94133

408-393-5873

James W Ambrosius

Reg. 27705

Patent attorney

Ecotech Law Group, P.C.

San Francisco, CA · 94105

925-786-1291

Sean P Ambrosius

Reg. 65290

Patent attorney

Via LLP

Irvine, CA · 92614

949-503-0449

Andrea Y Amey

Reg. 54573

Patent attorney

San Ramon, CA · 94583

925-216-9530

Lisa A Amii

Reg. 48199

Patent agent

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5000

Farzad E Amini

Reg. 42261

Patent attorney

Aikin & Gallant, LLP

Los Altos, CA · 94022

650-741-0956

Tashica Treshun Williams Amirgholizadeh

Reg. 71574

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-522-5927

Na An

Reg. 72899

Patent attorney

Genentech

South San Francisco, CA · 94080

801-662-9726

Nelson K. An

Reg. 84225

Patent agent

La Verne, CA · 91750

909-767-2844

Mona Anand

Reg. 34537

Patent attorney

Novato, CA · 94947

415-408-3393

Jeremy A Anapol

Reg. 75686

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626-7653

714-830-0600

Richard J Ancel

Reg. 26438

Patent attorney

Law Offices of Richard J. Ancel

W. Hollywood, CA · 90046

917-570-7411

Pamela C Ancona

Reg. 41494

Patent attorney

Roche Molecular Systems, Inc.

Pleasanton, CA · 94588

925-251-6708

Alex A. Andalis

Reg. 61991

Patent attorney

EncodedTherapeutics, Inc.

South San Francisco, CA · 94080

650-676-5962

Lael D Andara

Reg. 50019

Patent attorney

Dickinson-Wrights RLLP

Mountain View, CA · 94043-2201

408-701-6152

Joseph A Andelin

Reg. 66159

Patent attorney

Fish IP Law, LLP

Irvine, CA · 92612

949-943-8301

Ethan B Andelman

Reg. 48997

Patent attorney

Andelman Legal

Berkeley, CA · 94704

510-990-3585

Joel D Andersen

Reg. 83614

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4000

Robert L Andersen

Reg. 64047

Patent agent

Dolby Laboratories, Inc.

San Francisco, CA · 94103

415-558-0796

Braden E. Anderson

Reg. 82337

Patent agent

Wilson Sonsini Good & Rosati PC

Palo Alto, CA · 93404

917-301-1061

Carson D. Anderson

Reg. 76039

Patent attorney

Redwood City, CA · 94062

636-236-8781

Clifton L Anderson

Reg. 30989

Patent attorney

Cupertino, CA · 95015

408-676-6830

Denton L Anderson

Reg. 30153

Patent attorney

Leech Tishman Fuscaldo & Lampl, LLP

Pasadena, CA · 91103-3842

626-796-4000

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.