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 Latham & Watkins LLP, Knobbe, Martens, Olson, & Bear, LLP, and Donald R. Green.

Top cities in California

All practitioners in California

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

Andrew C Greenberg

Reg. 38476

Patent attorney

Napa, CA · 94558

813-334-64440

Shane E Greenberg

Reg. 45652

Patent attorney

Morris Law Firm

Burbank, CA · 91505

747-283-1144

Nathan A. Greenblatt

Reg. 61265

Patent attorney

Sidley Austin, LLP

Palo Alto, CA · 94304

650-565-7107

Grainger L. Greene

Reg. 62366

Patent agent

Verinata Health, Inc.

Redwood City, CA · 94063

650-503-5200

Nathan O. Greene

Reg. 56956

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

650-433-5632

Bruce Wayne Greenhaus

Reg. 37339

Patent attorney

Jaquez Land Greenhaus LLP

San Diego, CA · 92122-5966

619-980-2612

Bernard J Greenspan

Reg. 50598

Patent agent

Greenspan IP Management

San Diego, CA · 92127-1061

858-442-8152

Martin R Greenstein

Reg. 26173

Patent attorney

TechMark a Law Corporation

San Jose, CA · 95124-5273

408-266-4700

Sara R Greenwald

Reg. 55225

Patent agent

Sara Greenwald

San Francisco, CA · 94112

415-923-1786

Uri M Greenwald

Reg. 72686

Patent attorney

Laguna Beach, CA · 92651

650-505-0011

Kyle Nadir Greenway

Reg. 901459

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

310-514-6625

Aris Gregorian

Reg. 72357

Patent attorney

Schwegman Lundberg & Woessner, P.A.

San Jose, CA · 95113

612-373-6900

Draper B Gregory

Reg. 22200

Patent attorney

Draper B. Gregory, SBN 31296

Chico, CA · 95928

530-809-1771

Matthew D. Greisen

Reg. 83492

Patent agent

Cionca IP Law P.C.

Irvine, CA · 92614

949-334-3036

Donna J Gressler

Reg. 45544

Patent agent

Gilead Sciences, Inc.

Foster City, CA · 94404

650-653-9470

Allison N. Greubel

Reg. 82758

Patent agent

Paul Hastings LLP

Palo Alto, CA · 94304

619-227-5320

Devinder S Grewal

Reg. 45977

Patent agent

Exponent, Inc.

Menlo Park, CA · 94025

650-688-7024

Heim Kirin Grewal

Reg. 82317

Patent attorney

Sacramento, CA · 95831

916-396-1296

Paul S Grewal

Reg. 43645

Patent attorney

Howrey LLP

East Palo Alto, CA · 94303

650-798-3500

Amy L. Greywitt

Reg. 66359

Patent attorney

Smith Baluch LLP

Larkspur, CA · 94939

480-329-4691

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.