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 GoPro, Inc, Valery Polyakov, Esq, and Cooley LLP.

Top cities in California

All practitioners in California

Vadim D Polonichko

Reg. 62769

Patent agent

GoPro, Inc

Carlsbad, CA · 92008

858-395-8348

Philip Birkner Polster· II

Reg. 43864

Patent attorney

Foster City, CA · 94404

314-775-4160

Valery R Polyakov

Reg. 77997

Patent attorney

Valery Polyakov, Esq

Oakley, CA · 94561

732-595-8127

Marcelo C Pomeranz

Reg. 70786

Patent attorney

Cooley LLP

San Diego, CA · 92121

858-550-6146

William Poms

Reg. 18782

Patent attorney

Santa Monica, CA · 90402

310-899-0281

Christopher S Ponder

Reg. 77167

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Menlo Park, CA · 94025

650-815-2676

Brandon M. Pongracz

Reg. 81009

Patent agent

San Francisco, CA · 94105

815-579-0818

Page M Ponsford

Reg. 66736

Patent attorney

Interdigital Holdings, Inc.

Los Altos, CA · 94022

510-359-7731

Elena Ponte

Reg. 77484

Patent attorney

San Francisco, CA · 94110

724-825-2493

Andrew Howard Pontious

Reg. 40776

Patent attorney

Collette Erickson Farmer & O'Neill LLP

San Francisco, CA · 94104

415-788-4646

James Michael Poole

Reg. 45311

Patent attorney

The Boeing Company

Seal Beach, CA · 90740

562-797-9014

Meghan McLean Poon

Reg. 73248

Patent attorney

Morrison & Foerster

Palo Alto, CA · 94304

650-813-4108

Aziz H Poonawalla

Reg. 77135

Patent agent

Venable

Los Angeles, CA · 90067

310-229-9905

Robert Popa

Reg. 43010

Patent attorney

Ladas and Parry

Los Angeles, CA · 90036

323-934-2300

Edward Gerard Poplawski

Reg. 33439

Patent attorney

Wilson Sonsini Goodrich & Rosati, P.C.

Los Angeles, CA · 90071-2027

323-210-2901

Bruce D Popp

Reg. 66903

Patent agent

Bien Fait, Translation and Patent Services

Laguna Niguel, CA · 92677

781-769-1637

Shane Michael Popp

Reg. 51090

Patent attorney

Los Angeles, CA · 90066

310-930-6051

Melissa A. Poquette

Reg. 66522

Patent agent

Electronic Bio Sciences LLC

San Diego, CA · 92121

714-351-5726

Gerald E Porter

Reg. 74917

Patent attorney

Orrick Herrington & Sutcliffe LLP

Los Angeles, CA · 90071

212-506-3593

Mitchell J. Porter

Reg. 80353

Patent agent

Arrowhead Pharmaceuticals, Inc.

San Diego, CA · 92131

858-355-9457

Scott A Porter

Reg. 63877

Patent agent

Redwood City, CA · 94062

650-363-2349

Timothy Allen Porter

Reg. 41258

Patent attorney

Google Inc.

Mountain View, CA · 94043

650-253-0000

Michael Portnov

Reg. 61225

Patent agent

Fish & Richardson, P.C.

Redwood City, CA · 94063

650-839-5070

Marina Portnova

Reg. 45750

Patent attorney

Lowenstein Sandler

Palo Alto, CA · 94301

650-433-5800

Douglas Portnow

Reg. 59660

Patent attorney

Schwegman, Lundberg, Woessner

San Jose, CA · 95113

408-660-2979

Ivan M Posey

Reg. 43865

Patent attorney

Leech Tishman Fuscaldo & Lampl

Pasadena, CA · 91101

626-796-4000

John Joseph Posta· Jr

Reg. 20275

Patent attorney

Westlake Village, CA · 91362

805-496-4475

Marya A Postner

Reg. 42085

Patent attorney

Cooley Godward, LLP

Palo Alto, CA · 94306

650-843-5081

Vladimir Postnikov

Reg. 80111

Patent attorney

Mountain View, CA · 94043

570-661-1858

Brianna L Potter

Reg. 76748

Patent attorney

Baker Botts

Palo Alto, CA · 94304

650-739-7556

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.