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 Morgan, Lewis & Bockius LLP, Knobbe, Martens, Olson & Bear LLP, and Law Office of Thomas G. Mallon.

Top cities in California

All practitioners in California

Joseph J Mallon

Reg. 39287

Patent attorney

Knobbe, Martens, Olson & Bear LLP

Irvine, CA · 92614

858-707-4000

Thomas G Mallon

Reg. 66649

Patent attorney

Law Office of Thomas G. Mallon

Santa Clara, CA · 95051

408-910-0072

Martin I Mally

Reg. 46334

Patent agent

Merck and Co, Inc.

San Diego, CA · 92121

858-202-5411

Robert Edward Malm

Reg. 34662

Patent attorney

Pacific Palisades, CA · 90272

310-459-8728

Melissa L Malone

Reg. 56159

Patent attorney

Borson Law Group, PC

Lafayette, CA · 94549

925-310-2060

Richard D Malone

Reg. 51991

Patent attorney

Zumbrunn Law Corporation

Victorville, CA · 92393

760-245-5333

Patrick G Maloney

Reg. 67247

Patent attorney

Valley Glen, CA · 91401

858-254-1679

Phillip Dominick Mancini

Reg. 46743

Patent agent

Ojjo, Inc.

San Rafael, CA · 94903

415-786-4685

Michael J Mancuso

Reg. 54787

Patent attorney

ASML

San Diego, CA · 92127

185-886-95328

Saralynn Mandel

Reg. 31853

Patent attorney

MANDEL LAW OFFICE

Fair Oaks, CA · 95628

818-207-4980

Alec J. Mandell

Reg. 80469

Patent attorney

Edwards Lifesciences Corporation

Irvine, CA · 92614

949-400-9237

Lee Jay Mandell

Reg. 37176

Patent agent

Pacific Palisades, CA · 90272

424-272-9385

Jori K Mandelman

Reg. 44897

Patent attorney

San Francisco, CA · 94127

415-637-2633

Harish D Mandyam

Reg. 65386

Patent attorney

Mandyam

Marina del Rey, CA · 90292

310-822-5942

Lauren M. Mangano Drenkard

Reg. 76779

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

555-120-80047

Francesco N. Mangini

Reg. 79547

Patent agent

Weaver Austin Villeneuve & Sampson, LLP

Oakland, CA · 94612-0250

510-663-1100

Alexander M. Mann

Reg. 76694

Patent attorney

San Diego, CA · 92122

858-900-7228

Gary Dean Mann

Reg. 34867

Patent attorney

Sherman Oaks, CA · 91403

818-599-0517

Jeffry S Mann

Reg. 42837

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105

415-442-1000

Liberty Edward Mann· IV

Reg. 61397

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-651-3233

Robert W Mann

Reg. 48555

Patent attorney

Mann Patent Consulting

Alameda, CA · 94501

650-269-4468

Ramasamy M Mannan

Reg. 53266

Patent attorney

Magna Carta LLC

Walnut Creek, CA · 94597

203-605-1976

Alana C. Mannige

Reg. 71899

Patent attorney

Twilio Inc.

San Francisco, CA · 94105

415-390-2337

Amy S Manning

Reg. 56567

Patent attorney

Amy Manning

Belvedere, CA · 94920

415-627-8260

Eileen A Manning-Villar

Reg. 48993

Patent attorney

Eileen Manning-Villar, Attorney at Law

Pacifica, CA · 94044

650-784-6382

Johnny F R Manriquez

Reg. 51142

Patent attorney

Del Mar, CA · 92014

619-246-3033

Rick L. Mansel

Reg. 72849

Patent attorney

Lake Forest, CA · 92630

949-444-3727

Jonathan T Manson

Reg. 43774

Patent attorney

Google, Inc.

Mountain View, CA · 94043

650-623-4000

Danny M. Mansour

Reg. 68345

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626

714-830-0600

Casey Flores Manuel

Reg. 903117

Limited recognition

California Western School of Law

San Diego, CA · 92101-3046

925-787-2454

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.