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 Intellecctual Property Law Offices, Kubota & Basol LLP, and Silicon Edge Law Group LLP.

Top cities in California

All practitioners in California

Larry B. Guernsey

Reg. 40008

Patent attorney

Intellecctual Property Law Offices

Campbell, CA · 95008

408-558-9950

Samuel Jared Guerra

Reg. 79200

Patent agent

Kubota & Basol LLP

Los Angeles, CA · 90071

213-462-2614

Jayanta K Guha

Reg. 66137

Patent agent

West Hills, CA · 91307

818-610-8926

Mark P. Guidotti

Reg. 72249

Patent attorney

Silicon Edge Law Group LLP

Pleasanton, CA · 94588

925-621-2133

Joseph F Guihan

Reg. 73411

Patent agent

Treyz Law Group

San Francisco, CA · 94102

415-404-6519

Michael A Guiliana

Reg. 42611

Patent attorney

Via LLP

Mission Viejo, CA · 92692

949-868-4670

Robert O Guillot

Reg. 28852

Patent attorney

San Jose, CA · 95126

408-293-1941

Jeffrey W Guise

Reg. 34613

Patent attorney

Womble Bond Dickinson LLP

Irvine, CA · 92618

858-313-1418

Tigran Guledjian

Reg. 45746

Patent attorney

Quinn Emanuel Urquhart Oliver and Hedges, LLP

Los Angeles, CA · 90017

213-443-3000

Karima F Gulick

Reg. 74754

Patent attorney

Innovent Law P.C.

Aliso Viejo, CA · 92656

949-429-0212

Ronald Gulino

Reg. 69474

Patent attorney

San Diego, CA · 92130

858-395-1964

Arnold J Gum

Reg. 63375

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-5178

Kevin P Gum

Reg. 81665

Patent agent

The Boeing Company

Seal Beach, CA · 90740

425-237-5163

Linda G Gunderson

Reg. 46341

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-651-7351

Jonathan W Gunn

Reg. 55232

Patent agent

Redlands, CA · 92373

909-798-2689

Forrest E Gunnison

Reg. 32899

Patent agent

The Gunnison Law Firm

Carmel, CA · 93923

831-309-4144

John E Gunther

Reg. 43649

Patent agent

SoCal IP Law Group, LLP

Westlake Village, CA · 91362

805-230-1350

Hao Guo

Reg. 82983

Patent attorney

Prcopio Cory Hargraves & Savich LLP

Palo Alto, CA · 94306

314-737-1797

Jinyang Guo

Reg. 80483

Patent attorney

Pittsburg, CA · 94565

314-556-4188

Joyce Guo

Reg. 81826

Patent agent

Palo Alto, CA · 94304

650-843-7272

Michael J Guo

Reg. 67128

Patent attorney

salesforce.com, inc.

San Francisco, CA · 94105

415-819-4397

Richard M. Guo

Reg. 66055

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

Palo Alto, CA · 94301

650-326-2400

Tony S Guo

Reg. 70644

Patent attorney

tonyguo.com

Sacramento, CA · 95820

415-890-4145

Wei Guo

Reg. 84649

Patent agent

Alameda, CA · 94501

469-422-9175

Yuan Guo

Reg. 69421

Patent agent

Loza & Loza LLP

Upland, CA · 91786

714-453-9824

Yuntao Guo

Reg. 60560

Patent attorney

The Law Office of Daniel Guo, P.C.

San Diego, CA · 92130

858-869-9208

Anil Gupta

Reg. 64218

Patent agent

Saratoga, CA · 95070

408-406-9913

Anirma R Gupta

Reg. 38275

Patent attorney

Palo Alto, CA · 94303

650-324-2444

Anvita Gupta

Reg. 84366

Patent agent

Sacramento, CA · 95827

505-285-7103

Maneesh Gupta

Reg. 62657

Patent attorney

Proteus Digital Health

Redwood City, CA · 94065

650-637-6119

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.