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 Marvin H. Kleinberg, Duckor Spradling Metzger & Wynne, and Quinn Emanuel Urquhart Oliver & Hedges, LLP.

Top cities in California

All practitioners in California

Marvin H Kleinberg

Reg. 18402

Patent attorney

Marvin H. Kleinberg

TARZANA, CA · 91356

818-667-5328

Bernard Lester Kleinke

Reg. 22123

Patent attorney

Duckor Spradling Metzger & Wynne

San Diego, CA · 92103

619-209-3000

Benjamin Max Kleinman

Reg. 66856

Patent attorney

Quinn Emanuel Urquhart Oliver & Hedges, LLP

San Francisco, CA · 94111

415-875-6461

Christopher Klick

Reg. 48704

Patent agent

Aliso Viejo, CA · 92656

949-235-9496

Paul M Klima

Reg. 63697

Patent attorney

San Mateo, CA · 94403

650-823-8780

Gregory H. Kline

Reg. 57666

Patent agent

Life Technologies Corporation Att:IP Department

Carisbad, CA · 92008

650-246-2508

Keith Earl Kline

Reg. 32737

Patent attorney

THE KLINE LAW FIRM

Indio, CA · 92201

650-815-8303

Norman R Klivans· Jr

Reg. 33003

Patent attorney

Palo Alto, CA · 94301

650-208-4057

Robert Thomas Kloeppel

Reg. 26753

Patent attorney

Montgomery Creek, CA · 96065

530-337-9380

Daniel C Kloke

Reg. 58417

Patent attorney

Ahmann Kloke LLP

Palo Alto, CA · 94301-1479

650-665-7518

Claudia Kloss

Reg. 45448

Patent attorney

Hughes Hubbard & Reed, LLP

Los Angeles, CA · 90071

Martha S Klovstad

Reg. 68024

Patent agent

Palo Alto, CA · 94306

415-609-5839

Ethan Kluesner

Reg. 84104

Patent agent

Irvine, CA · 92614

212-849-3046

Edward A Kmett

Reg. 42746

Patent attorney

Fitzpatrick Cella Harper and Scinto

Costa Mesa, CA · 92626

714-540-8700

Kurtis G. Knapp

Reg. 72608

Patent agent

Pacifica, CA · 94044

914-708-0680

Steve Manfred Knauer

Reg. 38208

Patent attorney

Epicenter IP Group, LLC

Redwood City, CA · 94065

650-996-8165

Daniel J Knauss

Reg. 56393

Patent attorney

Cooley, LLP

Palo Alto, CA · 94304-1130

650-843-5000

George M Knight

Reg. 33409

Patent attorney

Hoyt and Knight

Pioneer, CA · 95666

209-295-5223

Josh Knight

Reg. 902997

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

480-330-2546

Matthew Wayne Knight

Reg. 36846

Patent attorney

Matt Knight/Prose.Progress, Inc.

Kentfield, CA · 94904

323-537-6980

Sadie E. Knight

Reg. 74539

Patent agent

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105-1596

415-442-1000

Marc Ryan Knittel

Reg. 55333

Patent agent

Splunk

San Francisco, CA · 94107

415-510-7806

Rick H Knock

Reg. 44841

Patent attorney

Clements and Knock, LLP

San Diego, CA · 92108

619-686-6900

Aeree Ko

Reg. 75981

Patent agent

Palo Alto, CA · 94301

650-433-5622

Cheng C Ko

Reg. 54227

Patent attorney

Pillsbury Winthrop Shaw Pittman LLP

San Diego, CA · 92101-3575

619-234-5000

Christine J Ko

Reg. 72994

Patent attorney

Anaheim, CA · 92807

714-974-5683

Jenny G Ko

Reg. 44190

Patent attorney

Siemens Corp.

Mountain View, CA · 94043

Jonathan L Ko

Reg. 71307

Patent attorney

Venable LLP

Los Angeles, CA · 90067

310-229-9900

Steve S. Ko

Reg. 58757

Patent attorney

Raj Abhyanker LLP

Palo Alto, CA · 94301

650-326-1313

Suk Moon Ko

Reg. 56388

Patent attorney

Newport Beach, CA · 92660

714-404-6603

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.