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 Anthem Blue Cross, Procopio, Cory, Hargreaves & Savitch LLP, and O'Melveny & Myers LLP.

Top cities in California

All practitioners in California

Adrian J Rowe

Reg. 63840

Patent agent

San Diego, CA · 92110

619-894-5015

Brian Frederick Rowe

Reg. 34006

Patent attorney

Anthem Blue Cross

Woodland Hills, CA · 91367

818-234-2823

Sheree Thelma Rowe

Reg. 59068

Patent attorney

Procopio, Cory, Hargreaves & Savitch LLP

Palo Alto, CA · 94304

650-645-9036

Clarence A. Rowland

Reg. 73775

Patent attorney

O'Melveny & Myers LLP

Los Angeles, CA · 90071

213-430-7245

Mark Daniel Rowland

Reg. 32077

Patent attorney

Ropes & Gray LLP

East Palo Alto, CA · 94303

650-617-4016

Anthony Q Rowles

Reg. 68673

Patent agent

Irell & Manella LLP

Los Angeles, CA · 90067

310-203-7635

Nicholas T. Rowlett

Reg. 84679

Patent agent

Dana Point, CA · 92624

949-464-7343

Robert D Rowlett· Jr

Reg. 41279

Patent attorney

Rowlett Law Group

Dana Point, CA · 92624

949-481-3000

Madhuri Roy

Reg. 64497

Patent attorney

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5000

Gene E Royce

Reg. 38291

Patent attorney

Lincoln, Gustatson & Cercos, LLP

San Diego, CA · 92101

619-233-1150

Ivan E Rozek

Reg. 54412

Patent agent

Savantek Patent Services

Sonoma, CA · 95476

415-331-1758

Roger P Rozek

Reg. 53535

Patent attorney

Law Offices of Roger P Rozek

San Francisco, CA · 94111

415-331-0310

Thomas Igor Rozsa

Reg. 29210

Patent attorney

Rozsa Law Group LC

Tarzana, CA · 91356-3346

818-783-0990

Lawrence F Rozsnyai

Reg. 58427

Patent attorney

Millbrae, CA · 94030

415-205-9936

Nancy Y. Ru

Reg. 64616

Patent agent

San Francisco, CA · 94102

David A Rubin

Reg. 40314

Patent attorney

Mirati Therapeutics, Inc.

San Diego, CA · 92121

917-319-9571

Kim T Rubin

Reg. 67900

Patent agent

Menlo Park, CA · 94025

650-328-3424

Michael B Rubin

Reg. 61231

Patent attorney

Bozicevic, Field &Francis LLP

Redwood City, CA · 94065

650-327-3400

Neil Alan Rubin

Reg. 67030

Patent attorney

Russ August & Kabat

Los Angeles, CA · 90025

310-826-7474

Mark Rubinshtein

Reg. 70451

Patent attorney

San Diego, CA · 92121

917-696-9348

Francisco Antonio Rubio-Campos

Reg. 45358

Patent attorney

Netlist, lnc.

Irvine, CA · 92617

949-377-0296

Katherine M Ruby

Reg. 65932

Patent agent

Torrance, CA · 90501

858-336-7210

Zachary I. Ruby

Reg. 74386

Patent attorney

Scale LLP

San Francisco, CA · 94104

206-930-9282

Holly Lynn Rudnick

Reg. 43065

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

714-453-9824

Praveen Rudraraju

Reg. 72207

Patent agent

Snell & Wilmer, LLP

Costa Mesa, CA · 92626

714-427-7448

Miguel J Ruiz

Reg. 61021

Patent attorney

Milbank, Tweed, Hadley & McCloy LLP

Los Angeles, CA · 90017

213-892-4596

Rod Alan Rummelsburg

Reg. 48178

Patent attorney

Culver City, CA · 90232

310-621-7009

Joseph J. Rumpler· II

Reg. 71544

Patent attorney

Paul Hastings LLP

Palo Alto, CA · 94304

650-320-1800

Thomas Arthur Runk

Reg. 30679

Patent attorney

Brooks Kushman P.C.

Los Angeles, CA · 90017-5780

562-708-3520

Michael D Ruse· Jr

Reg. 55900

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

619-695-4609

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.