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 Neurocrine Biosciences, Inc., Dexcom, and L. S. Squires.

Top cities in California

All practitioners in California

Lyle W Spruce

Reg. 53631

Patent agent

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-617-7235

Erikson C Squier

Reg. 67924

Patent attorney

Dexcom

San Diego, CA · 92121

888-738-3646

Lawrence Stanley Squires

Reg. 24060

Patent agent

L. S. Squires

Los Altos, CA · 94022-3804

650-949-3842

Pamela J Squyres

Reg. 52246

Patent agent

El Granada, CA · 94018

650-455-3378

Nina Kosana Srejovic

Reg. 40342

Patent attorney

Stanford Law School

Stanford, CA · 94305

650-723-2237

Hema G Sresty

Reg. 76869

Patent attorney

NASA

Pasadena, CA · 91109

818-354-2675

Arthi G. Srinivasan

Reg. 73675

Patent agent

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612

510-663-1100

Tara Srinivasan

Reg. 77091

Patent agent

Quinn Emanuel Urquhart & Sullivan LLP

San Francisco, CA · 94111

415-875-6600

Kanchan Sripathy

Reg. 65741

Patent agent

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Kyle M. St. James

Reg. 72791

Patent attorney

Rutan & Tucker, LLP

Costa Mesa, CA · 92626

714-641-5100

Wayne O Stacy

Reg. 45125

Patent attorney

Belvedere, CA · 94920

303-949-0643

Steven P. Stadler

Reg. 64094

Patent attorney

Reedley, CA · 93654

559-638-6977

Craig M Stainbrook

Reg. 45126

Patent attorney

Stainbrook & Stainbrook, LLP

Santa Rosa, CA · 95403

707-578-9333

Michael A Stallman

Reg. 29444

Patent attorney

Tiburon, CA · 94920

415-601-4099

John Sidney Stammreich

Reg. 47220

Patent agent

Applied Materials INC

Santa Clara, CA · 95054

408-986-3850

Gail J Standish

Reg. 40826

Patent attorney

Winston & Strawn, LLP

Los Angeles, CA · 90071

213-615-1731

Leo Stanger

Reg. 19188

Patent attorney

Stanger Law Office

Ukiah, CA · 95482

707-234-3261

Geoffrey T Staniford

Reg. 43151

Patent attorney

Staniford Tomita LLP

San Francisco, CA · 94159

510-295-9328

Francisco R Stanley

Reg. 45850

Patent attorney

FibroGen, Inc.

South San Francisco, CA · 94080

650-866-7329

Jared S. Stanley

Reg. 84658

Patent agent

Irvine, CA · 92617

317-750-5183

Michael P Stanley

Reg. 58523

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130

858-314-7795

Jaime Erin Staples

Reg. 50783

Patent attorney

San Francisco, CA · 94121

650-723-5326

Daniela Starcevic

Reg. 60019

Patent agent

Los Altos, CA · 94024

650-947-0845

Stepan Starchenko

Reg. 66403

Patent agent

ROPES & GRAY LLP

East Palo Alto, CA · 94303

650-617-4718

Jon R Stark

Reg. 30111

Patent attorney

Chao Hadidi Stark & Barker LLP

Menlo Park, CA · 94025

650-325-0220

Robert L Starnes

Reg. 41324

Patent attorney

Novozymes Inc.

Davis, CA · 95618

530-757-4715

Christiana E. State

Reg. 52045

Patent attorney

Orrick, Herrington & Sutcliffe LLP

Menlo Park, CA · 94025

650-614-7627

Dean G Stathakis

Reg. 54465

Patent attorney

UltimatEdge IP Law Group, P.C.

Irvine, CA · 92614

949-345-5678

Jonathan Z Statman

Reg. 71638

Patent attorney

Kubota & Basol LLP

Los Angeles, CA · 90071

213-408-0794

John C Stattler

Reg. 36285

Patent attorney

Law Office of John Stattler

Portola Valley, CA · 94028

650-851-1082

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.