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 Morrison & Foerster, LLP, KPPB, LLP, and Dickinson Wright RLLP.

Top cities in California

All practitioners in California

Marc A. McClain

Reg. 72741

Patent attorney

KPPB, LLP

Anaheim, CA · 92806

949-852-0000

Bret J. McClay

Reg. 70692

Patent attorney

Dickinson Wright RLLP

Mountain View, CA · 94043

408-701-6124

Thomas A McCleary

Reg. 38961

Patent attorney

Long Beach, CA · 90815

562-754-0959

Kelly B McClellan

Reg. 69944

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

650-467-2124

Forrest M. McClellen

Reg. 76553

Patent attorney

Morrison & Foerster, LLP

San Francisco, CA · 94105

415-268-7000

Thomas S McClenahan

Reg. 42856

Patent attorney

Masimo Corporation

Irvine, CA · 92618

949-297-7074

Clive M. McClintock

Reg. 70693

Patent attorney

McClintock IP

Mission Viejo, CA · 92692

949-424-2150

Julie Mitchell McCloskey

Reg. 47799

Patent attorney

Paso Robles, CA · 93446

310-344-7448

Barbara G. McClung

Reg. 33113

Patent attorney

Caribou Biosciences, Inc

Berkeley, CA · 94710

510-982-6030 EXT 117

Keith R McCollum

Reg. 53294

Patent attorney

Prothena BioSciences

South San Francisco, CA · 94080

650-615-2134

Whitney E. McCollum

Reg. 57547

Patent attorney

O'Melveny & Myers, LLP

San Francisco, CA · 94111

415-984-8700

John D McConaghy

Reg. 26773

Patent attorney

Karish & Bjorgum, PC

Pasadena, CA · 91103

213-545-8470

Robert M McConnell

Reg. 46912

Patent attorney

McConnell Law Firm

Los Angeles, CA · 90028

323-665-7355

Emily K McCorry

Reg. 83102

Patent attorney

Snell & Wilmer

Costa Mesa, CA · 92626

714-427-7403

Kathleen Susan McCowin

Reg. 29829

Patent attorney

San Francisco, CA · 94116

650-862-4703

Megan M McCoy

Reg. 51345

Patent agent

Kilpatrick Townsend and Stockton LLP

San Francisco, CA · 94111

415-273-4757

Miles C. McCoy

Reg. 84331

Patent attorney

Lompoc, CA · 93436

530-632-4557

Rebecca C McCracken

Reg. 50725

Patent attorney

Structure Law Group, LLP

San Jose, CA · 95110

408-441-7500

Thomas Paul McCracken

Reg. 38548

Patent attorney

XenoPort, Inc.

Santa Clara, CA · 95051

408-616-7430

Garreth W. McCrudden

Reg. 78804

Patent attorney

Morrison & Foerster, LLP

San Francisco, CA · 94105

415-268-6292

Kelly Justin McCrystle

Reg. 46257

Patent attorney

Menlo Park, CA · 94025

J Bruce McCubbrey

Reg. 20687

Patent attorney

Berkeley, CA · 94705

510-981-1405

Katherine A. McCulloch

Reg. 83248

Patent agent

Dickinson Wright, RLLP

San Diego, CA · 92130

858-397-4704

Mengke Xing McCullough

Reg. 76534

Patent attorney

Goodwin Procter LLP

Santa Monica, CA · 90401

771-200-2063

Theodore C McCullough

Reg. 56231

Patent attorney

Adobe, Inc.

San Francisco, CA · 94107

206-595-2502

Wilmot H McCutchen

Reg. 46373

Patent agent

Orinda, CA · 94563

925-253-1463

Annabelle V. McCutcheon

Reg. 83739

Patent agent

Oakland, CA · 94618

510-387-6821

Matthew L. McDermott

Reg. 80133

Patent agent

San Diego, CA · 92111

716-812-6690

Maximillian D McDonald

Reg. 80649

Patent attorney

Desmarais LLP

Corte Madera, CA · 94925

206-669-0227

Shawn E McDonald

Reg. 42861

Patent attorney

Foley & Lardner LLP

San Diego, CA · 92130

858-847-6700

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.