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 Rigsbee Legal, Wi-LAN Technologies, Inc., and Amyris, Inc..

Top cities in California

All practitioners in California

John Taylor Rigsbee· Jr

Reg. 40145

Patent attorney

Rigsbee Legal

San Francisco, CA · 94132

415-742-8419

Aditi Rijhsinghani

Reg. 75368

Patent agent

Fremont, CA · 94539

510-585-8211

Sean W Riley

Reg. 61658

Patent agent

San Diego, CA · 92126

858-229-2662

Brian K Rinaldi

Reg. 74427

Patent agent

Wi-LAN Technologies, Inc.

Costa Mesa, CA · 92626

408-564-2996

Cathy Elena Rincon

Reg. 34002

Patent attorney

Foster City, CA · 94404

650-571-1373

Christine S Ring

Reg. 42106

Patent attorney

Amyris, Inc.

Emeryville, CA · 94608

510-450-0761

Vanessa R. Ringgold

Reg. 68841

Patent attorney

K&L Gates

Irvine, CA · 92614

949-623-3604

Risto A Rinne· Jr

Reg. 37055

Patent agent

Complete Patenting Services

San Rafael, CA · 94901

415-457-6933

Mario Riojas Ramirez

Reg. 73630

Patent attorney

San Francisco, CA · 94115

520-551-4116

Justin J. Ripley

Reg. 59187

Patent attorney

Invoke IP

Daville, CA · 94526

603-512-1955

Spencer W Ririe

Reg. 66740

Patent attorney

Armond Wilson LLP

Newport Beach, CA · 92660

949-386-1341

Marcus L Risso

Reg. 53519

Patent attorney

Tope-McKay & Associates

Malibu, CA · 90265

310-266-5663

James Morrell Ritchey

Reg. 32594

Patent attorney

O'Banion and Ritchey LLP

Sacramento, CA · 95814

916-498-1010

David Brian Ritchie

Reg. 31562

Patent attorney

CanaanLaw, p. C.

Los Gatos, CA · 95030

650-862-6400

Bruce Douglas Riter

Reg. 27379

Patent attorney

Law Office Of Bruce D Riter

Los Altos, CA · 94022

650-948-6235

W William Ritt· Jr

Reg. 19100

Patent agent

Los Gatos, CA · 95032

408-356-4363

Michael J Ritter

Reg. 36653

Patent attorney

Mountain View, CA · 94041

650-576-0828

Ted Russell Rittmaster

Reg. 32933

Patent agent

Foley & Lardner LLP

Los Angeles, CA · 90071

213-972-4594

Maybelline Rivas

Reg. 62728

Patent agent

Torrance, CA · 90503

310-940-9697

Cecelia A. Rivera

Reg. 83293

Patent attorney

San Francisco, CA · 94105

415-979-6927

George Rivera

Reg. 902571

Limited recognition

University of San Diego School of Law

San Diego, CA · 92110

Nelson T Rivera

Reg. 65053

Patent attorney

University of California, Riverside

RIVERSIDE, CA · 92521

951-827-1012

Scot C Rives

Reg. 70849

Patent attorney

Western Digital Corporation

Irvine, CA · 92612

949-672-7000

Leena Rivina

Reg. 74836

Patent agent

Milpitas, CA · 95036-0824

310-880-3723

Raouf T Rizk

Reg. 68593

Patent attorney

The Eclipse Group, LLP

Irvine, CA · 92614

949-851-5000 X126

Juan M Rizo· Jr.

Reg. 82837

Patent attorney

Bowman and Brooke LLP

Costa Mesa, CA · 92626

310-380-6538

Michael A. Rizzuto

Reg. 81388

Patent agent

Newport Beach, CA · 92663

203-247-8482

Songkoo Ro

Reg. 80135

Patent agent

Santa Monica, CA · 90405

949-419-7092

Tamara I A Roach

Reg. 67790

Patent agent

Millbrae, CA · 94030

650-692-7791

Linda Marie Robb

Reg. 41273

Patent attorney

Xerox Corp.

Long Beach, CA · 90803

562-494-5214

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.