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 Lowenstein Sandler LLP, DLA Piper LLP (US), and Drew Granston, Patent Attorney.

Top cities in California

All practitioners in California

Neil John Graham

Reg. 51179

Patent attorney

Long Beach, CA · 90803

562-438-1709

Abraham J Granderson

Reg. 52959

Patent attorney

Redwood City, CA · 94061

650-646-5795

Kevin Oliver Grange

Reg. 60793

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

650-433-5748

Paige Granie

Reg. 81480

Patent agent

DLA Piper LLP (US)

Los Angeles, CA · 90067

716-908-4133

Andrew E Granston· Jr

Reg. 38473

Patent attorney

Drew Granston, Patent Attorney

San Diego, CA · 92126

858-695-8201

Allan H Grant

Reg. 48851

Patent attorney

Law Offices of Allan Grant

Riverside, CA · 92503

951-544-5248

Bruce David Grant

Reg. 47608

Patent attorney

Scientia IP, Inc.

Encinitas, CA · 92024

858-336-2003

Erica C. Grant

Reg. 82400

Patent agent

Haley Guiliano LLP

San Jose, CA · 95113

669-213-1070

Evita V. N. K. Grant

Reg. 83545

Patent agent

Yaaba P.C

Oakland, CA · 94619

617-259-7396

Harrison Taylor Grant

Reg. 77785

Patent agent

Irvine, CA · 92692

949-259-3026

James L Grant

Reg. 64383

Patent agent

Pfizer Inc.

La Jolla, CA · 92037

858-699-3627

Travis W Grant

Reg. 67716

Patent agent

San Diego, CA · 92101

858-663-7384

James M Grass

Reg. 50205

Patent agent

Garden Grove, CA · 92843

949-887-2932

John H Grate

Reg. 31761

Patent agent

Los Altos, CA · 94024

650--24-88840

Andrew J Gray· IV

Reg. 41796

Patent attorney

Morgan, Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-4000

Edward Gray

Reg. 35166

Patent agent

Los Angeles, CA · 90066-0629

310-398-4504

Gerald T Gray

Reg. 41797

Patent attorney

Leydig, Voit & Mayer Ltd

Walnut Creek, CA · 94596

925-482-0100

Gordon E Gray· III

Reg. 42602

Patent attorney

Gray Law Firm

Long Beach, CA · 90807

562-984-2020

James T Gray

Reg. 55220

Patent agent

San Luis Obispo, CA · 93405

425-293-6730

Keith P Gray

Reg. 46738

Patent attorney

Hillsborough, CA · 94010

415-505-9986

Elliott J. Greb

Reg. 79120

Patent attorney

Latham & Watkins LLP

San Diego, CA · 92130

858-523-5448

Lucas V. Greder

Reg. 80300

Patent agent

Mountain View, CA · 94041

763-334-0291

Christy L Green

Reg. 51754

Patent attorney

Knobbe, Martens, Olson, & Bear, LLP

Newport Beach, CA · 92614

949-760-0404

Donald R Green· Jr

Reg. 42603

Patent agent

Donald R. Green

San Marcos, CA · 92078

760-443-1461

Grant D Green

Reg. 31259

Patent attorney

Mintz, Levin

San Francisco, CA · 94104

415-696-5119

Julienne C. Green

Reg. 67013

Patent attorney

MiaSole'

Santa Clara, CA · 95050

408-919-5700

Kenneth L Green

Reg. 44724

Patent attorney

Averill and Green

Whittier, CA · 90605

562-698-8039

Mark L Green

Reg. 68583

Patent agent

Los Altos, CA · 94024

650-965-3331

Robert Alan Green

Reg. 28301

Patent attorney

Christie Parker and Hale LLP

Glendale, CA · 91203

626-795-9900

William P Green

Reg. 16961

Patent attorney

Pasadena, CA · 91107

626-449-6922

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.