California

Patent attorneys in California

California hosts 9,567 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 Barrett IP Law, Jones Day, and Loza & Loza, LLP.

Top cities in California

All practitioners in California

Robert A Barr

Reg. 32191

Patent attorney

Palo Alto, CA · 94306

650-302-0675

Carole F Barrett

Reg. 30609

Patent attorney

Barrett IP Law

San Francisco, CA · 94105

415-426-3568

John A Barrett

Reg. 56657

Patent agent

San Diego, CA · 92104

858-243-3172

Kyle T Barrett

Reg. 69735

Patent agent

Jones Day

Palo Alto, CA · 94303

650-739-3939

Lee E Barrett

Reg. 67689

Patent attorney

La Jolla, CA · 92037

858-255-8043

Patrick J Barrett

Reg. 26252

Patent attorney

Palo Alto, CA · 94303

650-218-3325

Tyler J Barrett

Reg. 57768

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

714-453-9824

Mark D Barrish

Reg. 36443

Patent attorney

Kilpatrick Townsend and Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Briana R. Barron

Reg. 70906

Patent attorney

Foster City, CA · 94404

650-524-7420

Monica A. Barrow

Reg. 79925

Patent agent

Newark, CA · 94560

510-366-3030

Amanda T Barry

Reg. 51435

Patent attorney

Pivot Bio

Berkeley, CA · 94710

513-815-8789

Daniel George Barry

Reg. 65423

Patent attorney

Barry IP Law

Mission Viejo, CA · 92691

949-943-2704

Beverly J. Bartels

Reg. 66806

Patent attorney

Occidental, CA · 95465

707-874-9204

Donald L Bartels

Reg. 28282

Patent attorney

Bartels Law Group

Burlingame, CA · 94011-1999

650-477-2950

Neil S Bartfeld

Reg. 39901

Patent agent

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

858-707-4202

Christopher Lynn Barton

Reg. 50839

Patent attorney

San Francisco, CA · 94114

502-418-2016

Daryl S Bartow

Reg. 56505

Patent attorney

McDermott Will & Emery LLP

Menlo Park, CA · 94025

650-815-7604

Thomas R Baruch

Reg. 24249

Patent attorney

Baruch Future Ventures

San Francisco, CA · 94129

415-931-3988

Girish M Basarkar

Reg. 64508

Patent attorney

Amazon Lab 126

Cupertino, CA · 95014

408-906-6400

Trent A Basarsky

Reg. 53972

Patent agent

Axon Instruments

Union City, CA · 94587

510-675-6307

Behdad Baseghi

Reg. 70463

Patent attorney

Law Offices of Behdad Baseghi

Tustin, CA · 92780

949-315-1153

Matthew C Bashaw

Reg. 54876

Patent agent

Napa, CA · 94559

650-279-0162

Lena A Basile

Reg. 44026

Patent attorney

Neumedicines, LLC

La Crescenta, CA · 91214

818-606-2638

Erwin J Basinski

Reg. 34773

Patent attorney

Basinski & Associates

San Jose, CA · 95159-0722

408-998-2565

Erol C. Basol

Reg. 65150

Patent agent

Kubota & Basol LLP

Los Angeles, CA · 90071

213-408-0792

Aziz Basrai

Reg. 53973

Patent agent

Shay Glenn LLP

San Mateo, CA · 94403

650-212-1700

Jonathan Y Bass

Reg. 69202

Patent agent

Procopio, Cory, Hargreaves & Savitch LLP

San Diego, CA · 92101

619-238-1900

Janene P Bassett

Reg. 45978

Patent attorney

Fox Group Legal

Los Angeles, CA · 90067

310-369-4227

Sarah Savage Bassett

Reg. 64618

Patent attorney

Hickman Palermo Truong & Becker

San Jose, CA · 95110

408-414-1080 X 458

Behfar Bastani-Booshehri

Reg. 52599

Patent agent

Palo Alto, CA · 94301

650-380-2771

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?

9,567 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.