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 Perkins Coie LLP, Sidley Austin Brown & Wood, and Product Support Solutions, Inc..

Top cities in California

All practitioners in California

Patrick J McKeever

Reg. 66019

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130-2080

858-720-5722

Denise L McKenzie

Reg. 43790

Patent attorney

Sidley Austin Brown & Wood

Los Angeles, CA · 90013

213-896-6663

Dorothy B. McKenzie

Reg. 31981

Patent attorney

Product Support Solutions, Inc.

Dublin, CA · 94568

925-208-2410

Christopher B. McKinley

Reg. 74403

Patent attorney

Finnigan Henderson Farabow Garrett & Dunner, LLP

Palo Alto, CA · 94304

650-849-6655

Jeffrey A McKinney

Reg. 43795

Patent attorney

McKinney Law Group APC

Half Moon Bay, CA · 94019

650-245-6723

Brian Kevin McKnight

Reg. 59914

Patent attorney

Polsinelli LLP

San Francisco, CA · 94111

202-772-8485

Craig McLaughlin

Reg. 44925

Patent attorney

Law Office of Craig McLaughlin

Seal Beach, CA · 90740

714-545-8500

George W McLaughlin

Reg. 31121

Patent attorney

Sacramento, CA · 95827

916-368-6599

Jane R McLaughlin

Reg. 32047

Patent agent

Davis, CA · 95616

530-758-2217

Austin McLeod

Reg. 75320

Patent agent

Stockton, CA · 95204

209-480-4336

Kevin S McLintock

Reg. 58398

Patent attorney

Logitech

Newark, CA · 94560

510-795-8500

Samuel A. McMahon

Reg. 74865

Patent attorney

Ultragenyx Pharmaceutical

Novato, CA · 94949

775-200-4128

Kajane McManus

Reg. 31642

Patent agent

Chula Vista, CA · 91910

619-427-7989

Thomas L McMasters

Reg. 45593

Patent attorney

Dublin, CA · 94568

919-451-8559

Darian K. McMillan

Reg. 81519

Patent agent

San Diego, CA · 92122

858-922-4780

Scott L. McMillan

Reg. 62079

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

510-663-1100

Katherine Ramlose McMorrow

Reg. 75733

Patent attorney

Los Angeles, CA · 90067

310-820-8800

Stephen W. McMullen

Reg. 62379

Patent agent

Torrance, CA · 90504

Tung-Yun McNally

Reg. 66725

Patent agent

ScienBiziP, P.C.

Los Angles, CA · 90071

213-426-1771

John Thomas McNelis

Reg. 37186

Patent attorney

Fenwick and West, LLP

Mountain View, CA · 94041

650-335-7133

Katherine Ellen McNutt

Reg. 77307

Patent attorney

Cooley LLP

Los Angeles, CA · 90071

213-561-3250

Ryan S. McPhee

Reg. 59752

Patent attorney

Kritzer McPhee LLP

San Diego, CA · 92101

619-758-3600

James L. McPherson

Reg. 63804

Patent attorney

Danville, CA · 94526

925-330-2981

Scott E McPherson

Reg. 53307

Patent attorney

Adli Law Group PC

Los Angeles, CA · 90071

213-623-6546

David C McPhie

Reg. 56412

Patent attorney

Irell & Manella LLP

Newport Beach, CA · 92660

949-760-5216

Jeffrey M McQuiston

Reg. 63109

Patent agent

McQIPLaw

San Diego, CA · 92177

858-232-8923

Susan Arlene McQuiston

Reg. 47787

Patent attorney

Law Office of Susan McQuiston

San Francisco, CA · 94114

415-205-6977

Timothy J. McShane

Reg. 82229

Patent attorney

Auburn, CA · 95602

408-221-1721

Karen K. McSwain

Reg. 64306

Patent agent

Shay Glenn LLP

San Mateo, CA · 94403

650-287-2174

Bryan G McWhorter

Reg. 70780

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

206-779-3071

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.