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 Gross & Associates, Knobbe, Martens, Olson & Bear, LLP, and Latham & Watkins LLP.

Top cities in California

All practitioners in California

Sasha S Grimm

Reg. 76082

Patent agent

Berkeley, CA · 94709

415-690-6987

Zachary B Grinovich

Reg. 80584

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Erik C Griswold

Reg. 69419

Patent agent

Penngrove, CA · 94951

707-529-5899

John M Grohs

Reg. 56768

Patent attorney

Thousand Oaks, CA · 91320

805-377-7823

Gabriel S Gross

Reg. 52973

Patent attorney

Latham & Watkins LLP

Menlo Park, CA · 94025

650-328-4600

Glen L Gross

Reg. 41808

Patent attorney

Gross & Associates

Fair Oaks, CA · 95628

916-962-3700

J Nicholas Gross

Reg. 34175

Patent attorney

Law Office of J. Nicholas Gross

Berkeley, CA · 94709

510-540-6300

Robert L. Gross· Jr.

Reg. 59086

Patent agent

Gross & Associates

Sacramento, CA · 95814

916-442-3700

Paul D Grossman

Reg. 36537

Patent attorney

Telegraph Hill Partners

La Jolla, CA · 92037

760-216-3269

Thomas A. Grossman Thompson

Reg. 61137

Patent agent

San Diego, CA · 92120

619-339-1439

Eric A Grote

Reg. 67331

Patent attorney

Grote Biotech Patent Law

San Francisco, CA · 03461-5113

415-767-9682

Henry J Groth

Reg. 39696

Patent attorney

Avago Technologies Limited

San Jose, CA · 95131

408-433-4578

Andre H Grouwstra

Reg. 71934

Patent agent

Morgan Hill, CA · 95037-7717

408-921-1134

John M Grover

Reg. 42610

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Timothy F Grubb

Reg. 37632

Patent attorney

Yorba Linda, CA · 92886

714-779-2545

Michael J. Gruben-Trejo

Reg. 72441

Patent attorney

Santa Clara, CA · 95051-3083

214-335-6084

Edward J Grundler

Reg. 47615

Patent agent

Park, Vaughan & Fleming LLP

Davis, CA · 95618-7759

530-759-1663

Richard S Gruner

Reg. 38716

Patent attorney

Santa Moncia, CA · 90405

310-801-3149

Douglas W Grunewald

Reg. 69806

Patent agent

Life Technologies

Carlsbad, CA · 92008

925-738-2549

Matthew J. Grunseth

Reg. 67736

Patent agent

City of Hope

Duarte, CA · 91010

626-471-7221

Chen Gu

Reg. 66612

Patent attorney

USPTO

San Jose, CA · 95131

916-807-0121

Hangbo G Gu

Reg. 82714

Patent agent

Mountain View, CA · 94040

650-338-6249

Tianhua Gu

Reg. 52480

Patent agent

Global IP Services

Winton, CA · 95388

209-676-2219

Wenwen Gu

Reg. L1210

Limited recognition

Luxshare Technologies International Inc.

Milpitas, CA · 95035

603-738-2596

Zhichong Gu

Reg. 56543

Patent attorney

Wong & Rees LLP

San Jose, CA · 95129

650-670-8805

Zhuanjia Gu

Reg. 51758

Patent attorney

Kirkland & Ellis LLP

Palo Alto, CA · 94303

650-859-7004

Terje Gudmestad

Reg. 32232

Patent attorney

Santa Ana, CA · 92705

714-296-4999

Wayne J Gueck

Reg. 58335

Patent agent

Carl Zeiss Meditec, Inc.

Dublin, CA · 94568

925-557-4611

Otto C. Guedelhoefer· IV

Reg. 73386

Patent agent

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Charles S Guenzer

Reg. 30640

Patent attorney

Law Offices of Charles Guenzer

Palo Alto, CA · 95303

650-387-4268

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.