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 Wilmer Cutler Pickering Hale and Dorr LLP, Avanir Pharmaceuticals, Inc., and Exact Sciences.

Top cities in California

All practitioners in California

Christine E Duh

Reg. 68902

Patent attorney

Wilmer Cutler Pickering Hale and Dorr LLP

Palo Alto, CA · 94304

650-858-6051

Brian Thomas Duk

Reg. 69742

Patent attorney

Avanir Pharmaceuticals, Inc.

Aliso Viejo, CA · 92656

949-238-4056

Jennifer M Duke

Reg. 52838

Patent agent

Exact Sciences

La Jolla, CA · 92037

619-837-6847

Jerome F Duluk· Jr

Reg. 50694

Patent agent

Santa Clara, CA · 95050

650-464-6789

Jacqueline C Dumais

Reg. 65528

Patent agent

Foster City, CA · 94404

650-341-6328

Margaret M Dunbar

Reg. 37818

Patent attorney

Telesis Bio Inc

San Diego, CA · 92121

858-735-5652

Scott Dunbar

Reg. 37124

Patent attorney

Second Sight Medical Products, Inc.

Sylmar, CA · 91342

818-833-5055

Dennis J. Duncan

Reg. 59508

Patent attorney

Walmart, Inc.

Sunnyvale, CA · 94086-4828

415-629-0216

James M Duncan

Reg. 44664

Patent attorney

Young Wooldridge, LLP

Bakersfield, CA · 93311

661-327-9661

John D Duncan

Reg. 48312

Patent agent

Scripps Laboratories

San Diego, CA · 92121

858-546-5800

Malcolm J Duncan

Reg. 50651

Patent attorney

SRI International

Menlo Park, CA · 94025

650-859-2000

Brian M Dunham

Reg. 69467

Patent attorney

Attorney At Law

Upland, CA · 91784

909-239-1510

Salpi Dunlap

Reg. 52841

Patent agent

Cognito Consulting, Inc.

San Carlos, CA · 94070

650-454-0899

James Matthew Dunlop

Reg. 79144

Patent agent

Wilson Sonsini Goodrich Rosati

San Diego, CA · 92130

858-350-2355

Chris A. Dunn

Reg. 82495

Patent agent

Platinum Intellectual Property PC

San Jose, CA · 95128

408-800-5884

Michael K Dunn

Reg. 60430

Patent agent

Ferring Research Institute, Inc.

San Diego, CA · 92121

858-657-1547

Michelle Chen Dunn

Reg. 69519

Patent attorney

Platinum Intellectual Property LLP

San Jose, CA · 95126

408-610-3099

Tracy J Dunn

Reg. 34587

Patent agent

Penn Valley, CA · 95946

650-799-9014

Richard A Dunning· Jr

Reg. 42502

Patent attorney

Poway, CA · 92064

831-325-1759

Thien-Chuong D Duong

Reg. 66259

Patent attorney

AD Law Group

Palo Alto, CA · 94304

415-889-8798

Andrew M Duquet

Reg. 84604

Patent agent

Kensington, CA · 94707

510-329-3459

Geetha Durairaj

Reg. 800110

Limited recognition

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Heidi D Duran

Reg. 64841

Patent attorney

San Francisco, CA · 94114

415-515-7877

Stephen C Durant

Reg. 31506

Patent attorney

MLO, a professional corportation

San Diego, CA · 92121

858-481-1883

Paul A Durdik

Reg. 37819

Patent attorney

Haynes Beffel and Wolfeld LLP

Half Moon Bay, CA · 94019

650-479-9245

Edward G Durney

Reg. 37611

Patent attorney

Patent Strategies

Millbrae, CA · 94030

650-244-9621

David Isaiah Duron

Reg. 79226

Patent attorney

Sacramento, CA · 95825

520-307-3292

Stephanie S Dusaban Gonzales

Reg. 75016

Patent attorney

Antheros Legal Advisors LLP

San Diego, CA · 92122

858-275-8657

David T Dutcher

Reg. 51638

Patent attorney

Sandisk

Milpitas, CA · 95035

801-232-2912

G Leland Dutcher· Jr

Reg. 43598

Patent attorney

Nissan North America, Inc.

Torrance, CA · 90502

310-768-1218

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.