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 Irell & Manella LLP, Schwegman Lundberg & Woessner, P.A., and Alfred E Mann Foundation.

Top cities in California

All practitioners in California

Lucas S Oxenford

Reg. 80533

Patent attorney

Irell & Manella LLP

Los Angeles, CA · 90067

310-203-7163

Marc A Pacaldo

Reg. 66732

Patent agent

Foster City, CA · 94404

650-574-8810

Raquel Pacheco

Reg. 58401

Patent agent

Schwegman Lundberg & Woessner, P.A.

San Jose, CA · 95113

612-373-6900

Brian M Pacilio

Reg. 81068

Patent agent

Alfred E Mann Foundation

Valencia, CA · 91355

661-702-6766

Robert M Padilla

Reg. 38987

Patent attorney

NASA-Ames Research Center

Moffett Field, CA · 94035-0001

650-604-0887

Nelle S Paegel

Reg. 55518

Patent attorney

Law Offices of Nelle S. Paegel

Glendora, CA · 91741

626-864-8744

Lucas M. Paez

Reg. 76885

Patent attorney

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-645-9690

Brett M. Page

Reg. 72022

Patent agent

Santa Clara, CA · 95051

704-996-9603

Joseph Edward Page

Reg. 35311

Patent agent

La Jolla, CA · 92037

858-699-6015

Donald J Pagel· Jr

Reg. 32832

Patent attorney

Law Office Of Donald J Pagel

San Jose, CA · 95112

408-995-0881

Antoinette D Paglia

Reg. 38988

Patent attorney

Hernandez & Paglia LLP

Los Ageles, CA · 90017

213-785-5144

Richard Henry Pagliery

Reg. 44276

Patent attorney

Vividion Therapeutics, Inc.

San Diego, CA · 92121

858-257-1535

Frank M Paharik

Reg. 51293

Patent attorney

San Francisco, CA · 94114

415-647-3238

Mark A. Pahor

Reg. 66332

Patent attorney

Kayser Pahor, Attorney, LLP

Orange, CA · 92867

714-984-2004

Raj D. Pai

Reg. 77792

Patent attorney

Squire Patton Boggs

palo alto, CA · 94304

650-843-3308

Sameer K Pai

Reg. 68953

Patent attorney

Invoke IP

Danville, CA · 94526

718-715-5322

Eugene M Paige

Reg. 55519

Patent attorney

Keker & Van Nest LLP

San Francisco, CA · 94111-1809

415-391-5400

John L Paik

Reg. 54355

Patent attorney

Crowell & Moring LLP

Irvine, CA · 92614

949-798-1392

Matthew S Paik

Reg. 74170

Patent attorney

TiVo Inc.

San Jose, CA · 95002

650-617-4819

Michael A Painter

Reg. 25701

Patent attorney

Isaacman, Kaufman and Painter

Los Angeles, CA · 90067

310-881-6800

Bum C Pak

Reg. 56916

Patent agent

Pak, Bum Chin

Los Angeles, CA · 90020

213-703-2737

Chong W Pak

Reg. 50504

Patent attorney

Cislo & Thomas, LLP

Los Angeles, CA · 90025

310-451-0647

Grace J Pak

Reg. 60446

Patent attorney

Wilson Sonsini Goodrich & Rosati

Los Angeles, CA · 90071

323-210-2921

James Young Pak

Reg. 58864

Patent attorney

Skadden, Arps, Slate, Meagher & Flom LLP

Palo Alto, CA · 94301

650-470-3197

Kyung Eun Pak

Reg. 63636

Patent attorney

San Diego, CA · 92101

619-786-1145

Ryan S. C. Pak

Reg. 70445

Patent attorney

Tustin, CA · 92782

213-785-7277

Yang S. Pak

Reg. 57685

Patent agent

Spinal Elements, Inc.

Carlsbad, CA · 92010

760-607-1545

Frank A Palase

Reg. 48983

Patent agent

DIRECTV

El Segundo, CA · 90245

310-200-9400

Andrew C. Palmer

Reg. 75840

Patent attorney

San Francisco, CA · 94104

415-851-2566

Grayson-Claire Palmer

Reg. 82876

Patent attorney

Recor Medical

Palo Alto, CA · 94303

408-396-9487

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.