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 Morrison & Foerster, LIFE TECHNOLOGIES CORPORATION, and Invitrogen Corporation.

Top cities in California

All practitioners in California

Mathew W dos Santos

Reg. 70530

Patent agent

Morrison & Foerster

San Francisco, CA · 94105

415-268-6378

Ashita A Doshi

Reg. 57327

Patent attorney

LIFE TECHNOLOGIES CORPORATION

Carlsbad, CA · 92008

Nishita A Doshi

Reg. 61573

Patent attorney

Invitrogen Corporation

Carlsbad, CA · 92008

760-268-8486

Shilpa G Doshi

Reg. 64513

Patent attorney

Walnut Creek, CA · 94596

925-899-4498

Curtiss C Dosier

Reg. 46670

Patent attorney

Via LLP

Irvine, CA · 92614

949-816-1077

Raymond M Doss

Reg. 61000

Patent attorney

Amgen Inc.

South San Francisco, CA · 94080

650-244-2000

Richard H Doss

Reg. 46241

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

Los Angeles, CA · 90017

213-443-3194

Nikki Michelle Dossman

Reg. 58655

Patent attorney

SoCal IP Law Group LLP

Westlake Village, CA · 91362

805-990-2646

Juan F Dotson

Reg. 55122

Patent agent

Law Office of Juan F. Dotson

Los Angeles, CA · 90071

213-426-2132

Michaela R Dotson

Reg. 55123

Patent attorney

San Diego, CA · 92120

619-741-6557

Yimeng Dou

Reg. 69770

Patent attorney

Kirkland & Ellis LLP

Costa Mesa, CA · 92626

213-680-8283

Sara A Doudar

Reg. 80660

Patent attorney

Morrison & Foerster

Los Angeles, CA · 90013

213-547-6714

Andrew M Douglas

Reg. 51212

Patent attorney

Knobbe Martens Olson and Bear LLP

Irvine, CA · 92614

949-760-0404

Earl M Douglas

Reg. 31723

Patent attorney

Allogene Therapeutics, Inc.

South San Francisco, CA · 94080

650-457-2700

Frederic M Douglas

Reg. 48813

Patent attorney

Irvine, CA · 92604-3051

949-293-0442

Nicholas D Doukas

Reg. 52460

Patent attorney

IRS, Office of Chief Counsel

San Francisco, CA · 94105

415-227-5101

Alan E Dow

Reg. 35123

Patent agent

Complete Genomics, Inc.

Mountain View, CA · 94043

650-943-2844

Karen B Dow

Reg. 29684

Patent attorney

Laa Jolla, CA · 92037

858-456-6271

Jerry T Dowell

Reg. 45571

Patent agent

Atascadero, CA · 93422

805-462-8144

Brendan Thomas Dowling

Reg. 78189

Patent attorney

Santa Monica, CA · 90403

213-640-7958

John W. Downing

Reg. 60326

Patent attorney

Kasowitz, Benson, Torres & Friedman, LLP

Redwood Shores, CA · 94065

650-453-5170

Kristy Joi Downing

Reg. 56671

Patent attorney

Huntington Beach, CA · 92647

248-296-0770

Trevor A Downs

Reg. 63594

Patent attorney

WET

Sun Valley, CA · 91352

818-769-6200

Charles M Doyle

Reg. 39175

Patent attorney

Roche Molecular Systems Inc.

Pleasanton, CA · 94588

925-730-8554

Matthew J. Doyle

Reg. 69171

Patent agent

Martinez, CA · 94553

925-490-5087

Michael Patrick Doyle

Reg. 49052

Patent agent

NuVasive, Inc

San Diego, CA · 92121

858-909-3355

Patrick Ohryn Doyle

Reg. 77713

Patent attorney

Nixon Peabody LLP

San Francisco, CA · 94111

415-984-8215

Paul R. Doyle· Jr.

Reg. 84716

Patent agent

Lake Forest, CA · 92691

949-409-9569

Ryan N. DoyLoo

Reg. 81805

Patent agent

Malibu, CA · 90265

310-990-0915

Paola Dozzo

Reg. 77602

Patent agent

Gilead Sciences

Foster City, CA · 94404

415-713-8805

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.