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 Aerovironment, Inc., Morrison & Foerster LLP, and Dowling Aaron Incorporated.

Top cities in California

All practitioners in California

Eric J Aagaard

Reg. 40478

Patent attorney

Aerovironment, Inc.

Monrovia, CA · 91016

626-357-9983

Anders T Aannestad

Reg. 43454

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130

858-720-5159

John R Aaron

Reg. 76269

Patent agent

Dowling Aaron Incorporated

Fresno, CA · 93711

559-432-4500

Eric L. Abada

Reg. 79683

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

415-217-3515

Lannah S. Abasi

Reg. 84059

Patent agent

K&L Gates LLP

Irvine, CA · 92614

949-623-3547

Evan K Abbaszadeh

Reg. 77455

Patent agent

San Francisco, CA · 94107

307-299-1484

Rita A Abbati

Reg. 50715

Patent attorney

San Diego, CA · 92127

858-201-8965

Ryan B Abbott

Reg. 68178

Patent attorney

Los Angeles, CA · 90025

310-421-2903

Hani Z Abdel-Sayed

Reg. 52544

Patent attorney

Rutan & Tucker, LLP

Costa Mesa, CA · 92626

714-641-5100

Mina M. Abdelmalek

Reg. 82239

Patent agent

pSemi Corporation

San Jose, CA · 95112

628-444-0345

Hidetada J Abe

Reg. 61182

Patent attorney

Buchalter, P.C.

Los Angeles, CA · 90017

213-891-0700

David B Abel

Reg. 32394

Patent attorney

Law Office of David B. Abel

Manhattan Beach, CA · 90266

310-937-1590

Kenton B Abel

Reg. 49051

Patent attorney

Hacienda Heights, CA · 91745

626-271-0631

Tom Abeles

Reg. 70891

Patent attorney

Evolve Discovery

San Francisco, CA · 94105

415-398-8600

Serge Abend

Reg. 24152

Patent attorney

Palo Alto, CA · 94301

650-326-6683

Tina Marie Abernethy

Reg. 56092

Patent attorney

Law Office of Tina M. Abernethy

Irvine, CA · 92618

949-623-8324

Julia E Abers

Reg. 31222

Patent attorney

Thousand Oaks, CA · 91360

805-523-2488

Raj V Abhyanker

Reg. 45474

Patent attorney

Raj Abhyanker, P.C.

Mountain View, CA · 94040

650-965-8731

Aaron B Abood

Reg. 64701

Patent agent

Google Inc.

Mountain View, CA · 94043

650-253-0000

Anthony M Aboseif

Reg. 58357

Patent attorney

Aboseif Law Offices

Newport Beach, CA · 92660-0764

714-253-7796

Colin P Abrahams

Reg. 32393

Patent attorney

Law Office Of Colin P Abrahams

Westlake Village, CA · 91362

805-750-9958

Susan L Abrahamson

Reg. 56040

Patent agent

Sangamo Biosciences, Inc.

Richmond, CA · 94804

510-970-6000

Jarett Kane Abramson

Reg. 47376

Patent attorney

Provivi, Inc.

Santa Monica, CA · 90404

310-828-2307

Daniel Abramzon

Reg. 59958

Patent agent

Genentech, Inc.

Burlingame, CA · 94010

650-296-9080

Cindy I Abravanel

Reg. 48403

Patent attorney

San Ramon, CA · 94583

415-217-6000

Maad H Abu-Ghazalah

Reg. 60176

Patent attorney

Pacifica, CA · 94044

650-777-7938

James J Aburto

Reg. 58119

Patent attorney

San Diego, CA · 92104

619-252-1765

Joseph L Acayan

Reg. 52402

Patent agent

Soquel, CA · 95073

415-359-6390

Saul Acherman

Reg. 72898

Patent attorney

Jafari Law Group, Inc.

Irvine, CA · 92612

949-362-0100

Jessica L Achtsam

Reg. 75684

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

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.