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 Google Inc, Law Office of Christopher Peil, and Schox Patent Group.

Top cities in California

All practitioners in California

Molly E. Peck

Reg. 65169

Patent agent

Google Inc

San Francisco, CA · 94105

847-523-0835

Kathleen L. Peek

Reg. 78545

Patent agent

Castro Valley, CA · 94552

925-549-1399

David M Peer

Reg. 74718

Patent attorney

Los Angeles, CA · 90014

213-443-5355

Christopher Ronald Peil

Reg. 45005

Patent attorney

Law Office of Christopher Peil

San Francisco, CA · 94122

415-896-4254

Wesley L. Peisch

Reg. 82165

Patent agent

Schox Patent Group

San Francisco, CA · 94107

888-775-9990

Francois Antoine Pelaez

Reg. 57838

Patent agent

QUALCOMM Incorporated

San Diego, CA · 92121

858-651-5802

Austen Pell

Reg. 70020

Patent attorney

Law Office of Austen Pell

Lake Elsinore, CA · 92532-7517

310-480-5137

Mark A Pellatiro

Reg. 53448

Patent agent

San Diego, CA · 92111

858-616-6402

Benjamin C Pelletier

Reg. 66734

Patent attorney

Haynes and Boone, LLP

San Francisco, CA · 94104

415-293-8922

Ronaldo G. Penaflor

Reg. 60641

Patent agent

IP TECH PROS Inc.

San Diego, CA · 92122

858-630-5389

Kyle M. Pendergrass

Reg. 57403

Patent agent

San Diego, CA · 92107

858-231-2473

Mark Edwin Thomas Penfold

Reg. 55531

Patent agent

mark Penfold

Mountain View, CA · 94041

650-996-2227

Anrong Peng

Reg. 77674

Patent agent

Sheppard Mullin Richter & Hampton LLP

Palo Alto, CA · 95035

650-352-1953

Tony Wei Peng

Reg. 56115

Patent attorney

Global Blood Therapeutics

South San Francisco, CA · 94080

650-822-8741

Albert S Penilla

Reg. 39487

Patent attorney

Martine & Penilla, LLP

Sunnyvale, CA · 94085

408-749-6903

Brittany M. Penn

Reg. 77509

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

William A Pennell

Reg. 53449

Patent attorney

AARVIG & ASSOCIATES, APC

San Bernardino, CA · 92408

909-307-0026

Michael J Pennington

Reg. 59064

Patent attorney

Michael J. Pennington

Chula Vista, CA · 91910

858-344-0666

Robert Ervin Pentzke

Reg. 37907

Patent agent

Anaheim, CA · 92801-3137

714-821-3711

Adrian Clement Percer

Reg. 46986

Patent attorney

Weil, Gotshal & Manges LLP

Redwood City, CA · 94065

650-802-3000

Donna Olivia Perdue

Reg. 51166

Patent attorney

Perdue IP Law, APC

San Diego, CA · 92117

619--86-5-7576

Laura E Pereira

Reg. 55534

Patent attorney

Roll-A-Shade, Inc.

Riverside, CA · 92503

951-245-5077

Krisha Yadavranjan Perera

Reg. 83173

Patent attorney

Gordon Rees Scully Mansukhani

San Diego, CA · 92101

619-760-9680

Edgar Perez

Reg. 63348

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7821

Nathaniel S. Perez

Reg. 77368

Patent agent

Dechert LLP

Costa Mesa, CA · 92626

714-319-6852

Bernadette M Perfect

Reg. 53267

Patent agent

Natera, Inc.

San Carolos, CA · 94070

650-249-909010500

Brittany J. Perla

Reg. 77705

Patent agent

Arcus Biosciences, Inc.

Hayward, CA · 94545

510-766-2608

Luis G Perla

Reg. 77556

Patent agent

Genentech, Inc.

South San Fransico, CA · 94080-4990

510-384-5963

Clifford Boris Perry

Reg. 43854

Patent attorney

Encinitas, CA · 92024

858-345-5520

Guy Perry

Reg. 46194

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-1367

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.