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 RPX Corporation, Dentons US LLP, and Apple Inc..

Top cities in California

All practitioners in California

Jennifer D Olson

Reg. 56629

Patent agent

Dentons US LLP

Palo Alto, CA · 94304-1125

650-798-0300

Joshua G. Olson

Reg. 65865

Patent attorney

Apple Inc.

Cupertino, CA · 95014

408-974-6064

Michael C Olson

Reg. 45728

Patent attorney

Law Office Of Michael C. Olson, P.C.

Newport Beach, CA · 92660

949-442-8940

Mary R Olynick

Reg. 42963

Patent attorney

Kwan & Olynick LLP

Berkly, CA · 94709

510-900-9501

Paul E Omholt

Reg. 59841

Patent agent

BrainCells Inc.

San Diego, CA · 92121-1122

858-812-7639

Randy Omid

Reg. 67439

Patent attorney

YHE Law LLP

Lafayette, CA · 94549

141-559-90604

Stephen Nicholas Ondrish

Reg. 900645

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

415-422-6752

Andrew S Ong

Reg. 69076

Patent attorney

Goodwin Procter LLP

Redwood City, CA · 94063

650-752-3153

Darryl J Ong

Reg. 67521

Patent attorney

RPX Corporation

San Francisco, CA · 94105

415-852-3084

Ellie Ong

Reg. 72048

Patent agent

Synopsys, Inc.

Sunnyvale, CA · 94085

650-584-5000

Eric T. Ong

Reg. 81691

Patent attorney

O'Melveny & Myers LLP

San Francisco, CA · 94111

415-984-8700

Julian K Ong

Reg. 46971

Patent attorney

SuccessFactors, Inc.

San Mateo, CA · 94404

650-645-2000

David W Ono

Reg. 42965

Patent attorney

Fox Entertainment Group

Beverly Hills, CA · 90213

310-369-1231

Thomas J Onofrey

Reg. 69650

Patent agent

Oxnard, CA · 93035

805-236-6328

Stephen R Onstot

Reg. 43843

Patent attorney

Walsworth, Franklin, Bevins & McCall, LLP

Los Angeles, CA · 90071

213-223-2052

Anselmo Ontiveros

Reg. 76281

Patent agent

RPX Corporation

San Francisco, CA · 94105

831-247-0705

Zachary B. Ontiveros

Reg. 79362

Patent agent

Joby Aviation

Santa Cruz, CA · 95060

951-837-0852

Christina A Onufryk

Reg. 59842

Patent agent

Quine Intellectual Property Law Group

Alameda, CA · 94501

415-235-7731

Kenneth B Oplinger

Reg. 53417

Patent attorney

Altera Corporation

San Jose, CA · 95134

408-544-7674

Craig Pieter Opperman

Reg. 37078

Patent attorney

c/o Lam Research

Fremont, CA · 94538

510-472-8080

Tess B Oram

Reg. 80980

Patent agent

WSGR

Palo Alto, CA · 94304-1050

202-257-9186

Lucian Orbai

Reg. 63876

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94303

650-849-3337

Maria Cecilia Orencia

Reg. 53419

Patent agent

Alexion Antibody Technologies

San Diego, CA · 92121

858-550-3490 X205

Christine M Orich

Reg. 44987

Patent attorney

Nicholson De Vos Webster & Elliott LLP

San Jose, CA · 95113

408-214-9684

Watson Andrew Orion

Reg. 46371

Patent attorney

Google Inc.

Mountain View, CA · 94043

650-253-4809

Anthony J Orler

Reg. 41232

Patent attorney

Koppel Patrick Heybl & Philpott

Westlake Village, CA · 91361

805-373-0060

Jonathan B Orlick

Reg. 31989

Patent attorney

Canoga Park, CA · 91304

818-700-8363

Constantine D Orogo

Reg. 53420

Patent agent

Mountain View, CA · 94042

Daniel E. Orr

Reg. 71996

Patent attorney

Wilson Sonsini

Palo Alto, CA · 94304-1050

302-304-7648

Elizabeth A Orr

Reg. 45937

Patent agent

Synthetic Genomics Inc.

La Jolla, CA · 92037

858-754-2941

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.