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 Law Office, The Mueller Law Office, PC, and ArentFox Schiff.

Top cities in California

All practitioners in California

Michael D Slessor

Reg. 57986

Patent agent

Arcadia, CA · 91006

626-818-3277

Greg Sletteland

Reg. 63921

Patent attorney

Los Angeles, CA · 90012

213-618-6398

James E Sloat

Reg. 52229

Patent attorney

San Francisco, CA · 94114

415-626-4892

James M Slominski

Reg. 39031

Patent attorney

Law Office

West Covina, CA · 91791

310-902-0981

David N Slone

Reg. 28572

Patent attorney

Palo Alto, CA · 94303

650-465-6549

Heather Lynn Slotnick

Reg. 39033

Patent attorney

The Mueller Law Office, PC

San Diego, CA · 92130

858-481-1883

Jessica J Slusser

Reg. 50890

Patent attorney

ArentFox Schiff

Los Angeles, CA · 90013

213-443-7533

Jonathan Andrew Small

Reg. 32631

Patent attorney

Google Inc.

Mountain View, CA · 94043

650-253-0262

Dennis R Smalley

Reg. 35364

Patent agent

Microfabrica Inc.

Van Nuys, CA · 91406

818-786-3322 X105

Brian M. Smallshaw

Reg. 81052

Patent agent

Huntington Beach, CA · 92647

714-749-4026

John A Smart

Reg. 34929

Patent attorney

San Jose, CA · 95120

469-393-4444

Margaret M Smart

Reg. 55626

Patent agent

Kumetrix, Inc.

Union City, CA · 94587

510-476-0950 X 220

Thalia Smart

Reg. 902868

Limited recognition

Thomas Jefferson School of Law

San Diego, CA · 92101

347-221-1021

Lance D Smemoe

Reg. 66152

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Albert C Smith

Reg. 20355

Patent attorney

Los Altos, CA · 94023

650-335-7296

Alexis E. Smith

Reg. 84455

Patent agent

Los Angeles, CA · 90071

925-344-3139

Alyson S. Smith

Reg. 83787

Patent agent

San Diego, CA · 92121

310-738-8692

Andrew V. Smith

Reg. 43132

Patent attorney

SF Bay Area Patents, LLC

San Ramon, CA · 94582

415-203-2782

Barton A Smith

Reg. 50763

Patent attorney

Barton A Smith Attorney At Law

San Jose, CA · 95120

408-268-1026

Bridget A. Smith

Reg. 63574

Patent attorney

Relativity Space, Inc.

Long Beach, CA · 90815

949-945-0943

Chihang Amy Ng Smith

Reg. 42931

Patent attorney

Rimon Law, PC

San Francisco, CA · 94111

415-683-5472

Christian Smith

Reg. 56996

Patent agent

San Jose, CA · 95124

408-371-4887

Christopher J Smith

Reg. 40179

Patent attorney

NGM Biopharmaceuticals, Inc

South San Francisco, CA · 94080

650-392-1784

Darryl A Smith

Reg. 37723

Patent attorney

VMware, Inc.

Palo Alto, CA · 94304

650-427-1049

David R Smith

Reg. 69930

Patent attorney

WilmerHale

Palo Alto, CA · 94304

650-858-6168

David B. Smith

Reg. 76126

Patent attorney

Murray Tech Law

Davis, CA · 95616

209-505-6155

Deborah M. Smith

Reg. 68648

Patent attorney

Wilson Sonsini Goodrich and Rosati, P.C.

San Diego, CA · 92130

858-350-2315

Dennis J. Smith

Reg. 69885

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320-1799

808-447-9045

Dominique E. Smith

Reg. 82920

Patent attorney

Polsinelli

Los Angeles, CA · 90067

310-229-1390

Ellen L. Smith

Reg. 74453

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130-2594

858-720-5700

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.