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 Oracle Corporation, Thermo Fisher Scientific, and The Law Office of Clay McGurk.

Top cities in California

All practitioners in California

John P McGuire· Jr

Reg. 41984

Patent attorney

Oracle Corporation

Santa Clara, CA · 95054

408-276-7493

Karen B McGuirk

Reg. 52936

Patent agent

Thermo Fisher Scientific

Carlsbad, CA · 92008

425-507-5756

Harold Clayton McGurk· IV

Reg. 34964

Patent attorney

The Law Office of Clay McGurk

Orange, CA · 92856

949-395-3942

Aaron P McGushion

Reg. 53300

Patent agent

Seal Beach, CA · 90740

562-598-6418

Terri L McHenry

Reg. 55111

Patent attorney

Green Shoots Legal PC

Burlingame, CA · 94010

415-715-7578

Terry A. McHugh

Reg. 33261

Patent attorney

MOUNTAIN VIEW, CA · 94040

650-968-2225

Alistair J McIntyre

Reg. 77474

Patent attorney

Knobbe. Martens, Olson & Bear, LLP

Irvine, CA · 92614

206-405-2000

David Charles McIntyre

Reg. 36866

Patent attorney

Johnson & Johnson

Fremont, CA · 94555

510-248-2340

Joan V McIntyre

Reg. 33733

Patent attorney

Berkeley, CA · 94705

510-612-4096

Ian A. McKee

Reg. 60860

Patent attorney

Relativity Space

Long Beach, CA · 90807

415-866-0514

Robert C McKee

Reg. 69646

Patent agent

Davis, CA · 95616

512-203-5360

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

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.