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 Aikin & Gallant, LLP, O'Melveny and Myers, and Aka Chan LLP.

Top cities in California

All practitioners in California

Jacob T Aikin

Reg. 62787

Patent attorney

Aikin & Gallant, LLP

Los Altos, CA · 94022

408-507-7605

Christiana M Ajalat

Reg. 50956

Patent agent

O'Melveny and Myers

Los Angeles, CA · 90071

213-430-6505

Gary T Aka

Reg. 29038

Patent attorney

Aka Chan LLP

Santa Clara, CA · 95050

408-800-1912

Christine M Akagi

Reg. 81282

Patent agent

Poway, CA · 92064

858-231-8244

Jessica C Akers

Reg. 52549

Patent agent

Garden Grove, CA · 92840

415-377-6516

Cennet Pelin Akgun

Reg. 902991

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

415-310-6711

Jay R Akhave

Reg. 50016

Patent agent

Claremont, CA · 91711

909-625-3761

Kauser M. Akhoon

Reg. 66803

Patent agent

Morrison & Foerster

San Diego, CA · 92130-2040

858-720-5133

Adeel S Akhtar

Reg. 41394

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

415-954-4114

Romiwa C Akpala

Reg. 59775

Patent attorney

Square, Inc

San Francisco, CA · 94103

415-375-3176

Eman Safaa Al-Hassan

Reg. 75495

Patent attorney

Hogan Lovells US LLP

Los Angeles, CA · 90067

310-785-4651

Omar K Al-Mesned

Reg. 73611

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Monica Alandete-Saez

Reg. 73260

Patent agent

University of California Davis

Davis, CA · 95616

530-752-2705

Rouzbeh Alani

Reg. 72964

Patent agent

Pleasanton, CA · 94588

925-872-7260

Gregory Albano

Reg. 80605

Patent agent

La Canada, CA · 91011

213-880-7781

Glenn P Albert· Jr

Reg. 37268

Patent attorney

AlbertDhand LLP

San Diego, CA · 92130

858-776-2453

Philip H Albert

Reg. 35819

Patent attorney

Haynes and Boone, LLP

San Francisco, CA · 94104

415-293-8900

Rachel E. Albert

Reg. 76892

Patent attorney

Santa Monica, CA · 90403

216-225-4246

David L Alberti

Reg. 43465

Patent attorney

Feinberg Day Alberti & Thompson, LLP

Menlo Park, CA · 94025

650-618-4361

Marek Alboszta

Reg. 39894

Patent agent

Electronic Scripting Products, Inc.

Palo Alto, CA · 94301

650-862-1085

Rachel D Albright

Reg. 47382

Patent attorney

CISCO Systems, Inc.

San Jose, CA · 95134-1706

408-526-4000

Elizabeth A Alcamo

Reg. 64133

Patent agent

Avalanche Biotechnologies, Inc.

Menlo Park, CA · 94025

650-833-7761

Eric J. Alcantara

Reg. 73201

Patent agent

Pacifica, CA · 94044

619-846-4447

John D Alden

Reg. 54957

Patent attorney

FibroGen, Inc.

San Francisco, CA · 94158

415-978-1522

Philip G Alden

Reg. 32189

Patent attorney

Applied Materials, Inc.

Sunnyvale, CA · 94087

650--27-9-0502

Tania Sarneghi Aleksanian

Reg. 903234

Limited recognition

University of San Diego School of Law

San Diego, CA · 92110

Ali R Alemozafar

Reg. 68180

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-493-9300

Kamilah Alexander

Reg. 57210

Patent attorney

Paul Hastings LLP

Palo Alto, CA · 94304

650-320-1800

Lisa E Alexander

Reg. 41576

Patent attorney

Amgen Inc.

South San Francisco, CA · 94080

650-244-2968

Ryan S Alexander

Reg. 57539

Patent attorney

Jeffer Mangels Butler & Mitchell LLP

Los Angeles, CA · 90067

310-785-6775

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.