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 Bristol Myers Squibb, Hickman Palermo Becker Bingham, LLP, and Western digital.

Top cities in California

All practitioners in California

Theodore S Park

Reg. 26971

Patent attorney

Saratoga, CA · 95070

408-867-2740

Aaron S Parker

Reg. 74355

Patent attorney

Bristol Myers Squibb

San Diego, CA · 92121

858-349-8522

Daniel W. Parker

Reg. 73390

Patent attorney

Hickman Palermo Becker Bingham, LLP

San Jose, CA · 95113

408-414-1236

Jennifer L. Parker

Reg. 71268

Patent attorney

Riverside, CA · 92507

951-545-7122

Joshua J Parker

Reg. 62021

Patent attorney

Western digital

Irvine, CA · 92612

949-517-8066

Michael Andrew Parker

Reg. 45896

Patent agent

Western Digital Corporation

San Jose, CA · 95119

408-717-9177

Robert B Parker

Reg. 42061

Patent attorney

The Boeing Company

Huntington Beach, CA · 92647-2099

714-896-4649

Sandra Melissa Parker

Reg. 36233

Patent agent

Law Office of Sandra M. Parker

Long Beach, CA · 90803

562-595-2948

David G Parkhurst

Reg. 29422

Patent attorney

Los Angeles, CA · 90045

424-227-6202

Sean F Parmenter

Reg. 53437

Patent attorney

Parmenter Intellectual Property Law PLLC

Sacramento, CA · 95811

925-482-6515

Norman Alfred Parris

Reg. 36319

Patent agent

Carmel, CA · 93923-7959

831-652-1532

Trevor J Parry

Reg. 76091

Patent agent

Morrison & Foerster LLP

San Diego, CA · 92130

858-314-7797

George Theodore Parsons

Reg. 34690

Patent agent

San Diego, CA · 92139

619-267-4760

Gerald P Parsons

Reg. 24486

Patent attorney

San Rafael, CA · 94901-1740

415-457-3570

James Edward Parsons

Reg. 34691

Patent attorney

Brocade Communications Systems, Inc.

San Jose, CA · 95134

408-333-2303

Lisa N Partain

Reg. 40763

Patent attorney

Irell and Manella, LLP

Los Angeles, CA · 90067

310-203-7952

Jason R Partee

Reg. 66550

Patent agent

Rolling Hills, CA · 90274

310-704-0877

Mani Partheesh

Reg. 72106

Patent attorney

Nextbit Systems, Inc.

San Francisco, CA · 94107

916-221-2074

Puya Partow-Navid

Reg. 59657

Patent attorney

Seyfarth Shaw LLP

Los Angeles, CA · 90067

310-277-7200

Shaham Kameron Parvin

Reg. 60044

Patent attorney

Parvin Law Group

Sunnyvale, CA · 94086

415-272-6369

Joshua D Parzivand

Reg. 80650

Patent attorney

Redwood City, CA · 94065

818-324-9495

Erica J Pascal

Reg. 47846

Patent attorney

DLA Piper, LLP

San Diego, CA · 92101-4297

619-699-2639

Jennifer Mendel Pascua

Reg. 56489

Patent attorney

Illumina, Inc.

San Diego, CA · 92122

858-291-9124

Yana Pashyan

Reg. 81835

Patent attorney

N/A, CA · 91504

818-669-6429

Danielle M Pasqualone

Reg. 43847

Patent attorney

Five Prime Therapeutics, Inc.

South San Francisco, CA · 94080

650-745-9674

Kevin M. Pasquinelli

Reg. 63913

Patent attorney

Robins Kaplan LLP

Mountain View, CA · 94040

650-784-4040

Dahna S Pasternak

Reg. 41411

Patent attorney

Pasternak Patent Law

Palo Alto, CA · 94303

650-391-9661

Brian D Pastore

Reg. 65730

Patent attorney

Pastore Law

San Diego, CA · 90245

617-947-7512

Kirk Pastorian

Reg. 48756

Patent attorney

Agilent Technologies Inc.

Santa Clara, CA · 95051

650-274-3153

Kathleen A Pasulka

Reg. 35652

Patent attorney

Procopio Cory Hargreaves & Savitch, LLP

San Diego, CA · 92101

619-525-3827

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.