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 Morrison & Foerster LLP, Koppel Patrick Heybl & Philpott, and Caldwell.

Top cities in California

All practitioners in California

Brian A Donahue

Reg. 58206

Patent agent

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-5632

Corey A Donaldson

Reg. 69856

Patent attorney

Koppel Patrick Heybl & Philpott

Westlake Village, CA · 91361

805-373-0060

Lindsey E. Doncost

Reg. 81908

Patent attorney

Caldwell

Santa Monica, CA · 90401

424-229-2947

Dalei Dong

Reg. 60363

Patent agent

Qualcomm Inc

San Diego, CA · 92121

858-845-3740

John J Dong

Reg. 68012

Patent agent

The Boeing Company

Huntington Beach, CA · 92647

714-372-2906

Liming Dong

Reg. 65759

Patent agent

San Diego, CA · 92105

858-692-6041

Meimei Dong

Reg. 81792

Patent agent

Pasadena, CA · 91125

626-395-3288

Yaohua Dong

Reg. 72008

Patent agent

BridgeBio Oncology Therapeutics (BBOT)

South San Francisco, CA · 94080

415-596-5599

Darren Donnelly

Reg. 44093

Patent attorney

Polsinelli LLP

Palo Alto, CA · 94304

650-461-7735

Kevin M Donnelly

Reg. 61643

Patent agent

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

650-663-1100

Christian J. Donovan

Reg. 82560

Patent agent

Nixon Peabody LLP

San Francisco, CA · 94111

415-984-8200

Michelle Hon Donovan

Reg. 59025

Patent attorney

Duane Morris LLP

San Diego, CA · 92101

619-744-2200

Stephen Donovan

Reg. 33433

Patent attorney

Allergan, Inc.

Irvine, CA · 92623

714-246-4026

Ryan K. Dooley

Reg. 76234

Patent attorney

El Cerrito, CA · 94530

510-590-7926

Neslihan I. Doran-Civan

Reg. 64883

Patent attorney

Kilpatrick Townsend & Stockton LLP

San Francisco, CA · 94111

415-273-4845

Janet E Dorling

Reg. 45214

Patent agent

Genentech

South San Francisco, CA · 94080

650-225-6730

David W Dornblaser

Reg. 46281

Patent attorney

Law Offices of David Dornblaser

San Jose, CA · 95131

408-209-5879

Yanniv Y. O. Dorone

Reg. 83476

Patent agent

San Carlos, CA · 94070

650-666-7550

Colin T Dorrian

Reg. 54658

Patent agent

Christie, Parker & Hale LLP

Pasadena, CA · 91109

626-795-9900

Chandler C Dorris

Reg. 77523

Patent agent

Orrick, Herrington & Sutcliffe

San Francisco, CA · 94105-2669

734-635-1988

Christopher R. Dorsett

Reg. 80297

Patent attorney

Jones Day

San Diego, CA · 92121

858-314-1126

Emily Suet Kan Dorsett

Reg. 57086

Patent agent

Los Angeles, CA · 90049

310-476-0252

David A Dorth

Reg. 56053

Patent attorney

San Francisco, CA · 94116

847-922-8306

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

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.