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 Karish & Bjorgum PC, Cooley LLP, and CytomX Therapeutics.

Top cities in California

All practitioners in California

Billy Alvin Robbins

Reg. 18313

Patent attorney

Karish & Bjorgum PC

Pasadena, CA · 91103

213-785-8070

Georgia Claire Robbins

Reg. 81181

Patent agent

Cooley LLP

San Diego, CA · 92121

858-550-6181

Leslie J. Boley Robbins

Reg. 41490

Patent attorney

CytomX Therapeutics

South San Francisco, CA · 94080

650-763-9497

Michael L Robbins

Reg. 54774

Patent attorney

Applied Materials

Santa Clara, CA · 95054

408-643-1236

Steven John Robbins

Reg. 40299

Patent attorney

San Diego, CA · 92103-6069

619-299-0060

Christopher M Roberge

Reg. 74482

Patent agent

Kilpatrick Townsend and Stockton LLP

San Francisco, CA · 94111

415-576-0200

Brett J. Roberts

Reg. 75139

Patent agent

Revolution Medicines

Redwood City, CA · 94063

816-534-8966

Byron N Roberts

Reg. 75025

Patent agent

University of California, Davis

Davis, CA · 95618

530-754-8689

Edward Earl Roberts

Reg. 26024

Patent attorney

Dana Point, CA · 92629

949-365-5717

Emily J. Roberts

Reg. 81412

Patent attorney

Morrison & Foerster LLP

San Francisco, CA · 94105

141-523-18674

John S Roberts

Reg. 36655

Patent agent

Medlen S. Carroll, LLP

Oakland, CA · 94612

415-957-5935

Kenneth S Roberts

Reg. 38283

Patent attorney

One LLP

Newport Beach, CA · 92660

949-502-2870

Larry Keith Roberts

Reg. 28464

Patent attorney

Law Offices Of Larry K Roberts INC

Newport Beach, CA · 92658

949-640-6200

Paul Andrew Roberts

Reg. 40289

Patent attorney

SOLO & OF COUNSEL w Snyder Clark Lesch & Chung LLP

Los Gatos, CA · 95032

703-869-0670

Raymond E Roberts

Reg. 38597

Patent attorney

Intellectual Property Venture Group

Ontario, CA · 91764-5556

909-962-7010

Ryan R. Roberts

Reg. 82877

Patent attorney

San Carlos, CA · 94070

903-521-7990

Ryan Michael Roberts

Reg. 65012

Patent attorney

Simpson Thacher & Bartlett LLP

Palo Alto, CA · 94304

650-251-5038

Kelsey J. Roberts Kingman

Reg. 79382

Patent agent

Morrison & Foerster, LLP

Palo Alto, CA · 94304

650-889-0114

Gerald L Robertson

Reg. 37224

Patent attorney

Law Offices of Gerald L. Robertson & Associates

Napa, CA · 94558

707-226-2616

David J Robeson

Reg. 38598

Patent agent

EnergyTech Patents

Dublin, CA · 94568

925-833-2561

Roberta L Robins

Reg. 33208

Patent attorney

Robins Law Group

Palo Alto, CA · 94306

650-906-4228

Carmen K. Robinson

Reg. 59489

Patent attorney

Pfizer Inc.

San Diego, CA · 92121

858-261-4368

Doretha Loretta Robinson

Reg. 45048

Patent attorney

El Sobrante, CA · 94820

510-206-0319

Douglas W Robinson

Reg. 68274

Patent attorney

Shook, Hardy & Bacon L.L.P.

Irvine, CA · 92614

949-475-1500

Edward Darius Robinson

Reg. 43049

Patent attorney

San Diego, CA · 92107

619-213-7483

Jill L Robinson

Reg. 34911

Patent attorney

Moraga, CA · 94556

925-376-8481

Kathleen C Robinson

Reg. 76196

Patent agent

South San Francisco, CA · 94080

650-467-5308

Leslie A Robinson

Reg. 54403

Patent attorney

Cullgen inc.

San Diego, CA · 92130

858-284-0115

Mark Vernon Robinson

Reg. 43051

Patent attorney

Law Office of Mark V. Robinson

Vacaville, CA · 95688

707-451-9913

Patricia Ann Robinson

Reg. 53525

Patent attorney

Elan Pharmaceuticals Inc.

South San Francisco, CA · 94080

650-877-0900

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.