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 DeBoo & Company, Stubbs Alderton & Markiles, LLP, and ArentFox Schiff.

Top cities in California

All practitioners in California

Phillip J DeBiase

Reg. 69938

Patent attorney

San Francisco, CA · 94118

202-549-3983

Dennis A DeBoo

Reg. 42471

Patent agent

DeBoo & Company

Sacramento, CA · 95814

916-419-5498

Kevin D DeBre

Reg. 38121

Patent attorney

Stubbs Alderton & Markiles, LLP

Sherman Oaks, CA · 91403

818-444-4521

G. Keith deBrucky

Reg. 29145

Patent attorney

Placentia, CA · 92870

714-993-3387

Erika R. DeCosty

Reg. 78229

Patent attorney

ArentFox Schiff

San Francisco, CA · 94104

415-805-7991

Peter W. Deelman

Reg. 79626

Patent agent

HRL Laboratories, LLC

Malibu, CA · 90265

310-317-5843

Edmond A DeFrank

Reg. 37814

Patent attorney

Northridge, CA · 91326

818-554-4073

May Lin DeHaan

Reg. 42472

Patent attorney

The Morales Law Firm

San Jose, CA · 95128

888-836-0880

Michael J DeHaemer· Jr

Reg. 39164

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-845-5448

Peter Jean Dehlinger

Reg. 28006

Patent attorney

King & Spalding LLP

Redwood Shores, CA · 94065

650-590-0700

Kevin J Dehoff

Reg. 62993

Patent attorney

Plymouth, CA · 95669

209-256-6292

James C. Deirmendjian

Reg. 73044

Patent agent

Moorpark, CA · 93021

805-907-6151

Gerald R DeJean

Reg. 70759

Patent agent

Raytheon Technologies

El Segundo, CA · 90245

404-939-3407

Soumitra Deka

Reg. 70252

Patent attorney

Squire Patton Boggs (US) LLP

San Francisco, CA · 94104

415-954-0202

Jesus Del Castillo

Reg. 51604

Patent attorney

Bridgelux, Inc.

Fremont, CA · 94538

925-583-8661

Nancy G J Delaet

Reg. 56338

Patent agent

San Diego, CA · 92126

858-271-7009

James Alfred Deland

Reg. 31242

Patent attorney

James Deland

Sacramento, CA · 95825

916-838-0526

James P Delaney· Jr

Reg. 45578

Patent attorney

Lorenz & Kopf, LLP

San Diego, CA · 92130

858-461-7030

Karoline A Delaney

Reg. 44058

Patent attorney

Knobbe Martens Olson and Bear, LLP

Irvine, CA · 92614

949-760-0404

Anthony Delas

Reg. 49067

Patent attorney

Los Gatos, CA · 95032

408-356-0729

Wyatt J. Delfino

Reg. 75380

Patent attorney

Kriya Therapeutics, Inc.

Redwood City, CA · 94065

650-502-2744

Michael R DeLong

Reg. 81078

Patent agent

UCLA

Los Angeles, CA · 90095

310-825-5510

Richard Louis DeLucia

Reg. 28839

Patent attorney

ORRICK, HERRINGTON & SUTCLIFFE LLP

Irvine, CA · 92614

212-506-3592

Mallary K deMerlier

Reg. 51609

Patent attorney

VEROS LEGAL SOLUTIONS, LLP

San Diego, CA · 92106

858-987-4075

Sevag Demirjian

Reg. 68850

Patent attorney

Demirjian Law Offices

North Hollywood, CA · 91602

310-870-3977

Zachary P Demko

Reg. 66785

Patent agent

Gene Security Network

Redwood City, CA · 94063

617-312-2139

Ypsita Demunshi

Reg. 79795

Patent agent

Pendulum Therapeutics

San Francisco, CA · 94071

914-506-1053

Christl M. N. Denecke

Reg. 51610

Patent attorney

Goodwin Procter LLP

Menlo Park, CA · 94025

650-752-3100

Lin Deng

Reg. 68397

Patent attorney

Veeva Systems Inc.

Pleasanton, CA · 94588

925-475-4827

Qiming Deng

Reg. 74051

Patent attorney

Exact Sciences Corporation

La Jolla, CA · 92037

317-752-8029

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.