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 Morris Law Firm, Sidley Austin, LLP, and Verinata Health, Inc..

Top cities in California

All practitioners in California

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 attorney

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

John A Griecci

Reg. 39694

Patent attorney

Law Office Of John A Griecci

Encino, CA · 91436

310-793-8222

Brian D Griedel

Reg. 48425

Patent attorney

Soladigm, Inc

Milpitas, CA · 95035

408-514-6575

Edward D Grieff

Reg. 38898

Patent attorney

Mintz Levin Cohn Ferris Glovsky and Popeo, PC

San Diego, CA · 92130

858-314-1898

Scot A Griffin

Reg. 38167

Patent attorney

Redwood City, CA · 94062

408-761-2694

Aldon Griffis

Reg. 55949

Patent agent

DLA Piper LLP (US)

San Diego, CA · 92121

858-638-6756

Brian J Griffith

Reg. 41807

Patent attorney

San Diego, CA · 92130

858-449-5935

John F Griffith

Reg. 44137

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612-0250

510-663-1100

Michael S Griffo

Reg. 66640

Patent agent

Redwood City, CA · 94061

831-234-7732

Angela C Griggs

Reg. 73410

Patent agent

Perkins Coie, LLP

San Francisco, CA · 94105

415-344-7062

Divyata K Griggs

Reg. 73765

Patent agent

Palo Alto Research Center

Palo Alto, CA · 94304

650-812-4021

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.