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 Law Office of Barrick P. Lo, Salesforce.com, Inc,, and VENL LLC.

Top cities in California

All practitioners in California

Barrick Pak-Wai Lo

Reg. 64352

Patent attorney

Law Office of Barrick P. Lo

San Diego, CA · 92126

858-353-0557

Denise Yuen Ming Lo

Reg. 53229

Patent attorney

Salesforce.com, Inc,

San Francisco, CA · 94105

415-536-5013

Elaine H Lo

Reg. 41158

Patent attorney

Oceanside, CA · 92056

760-724-3962

Hsi Wen Lo

Reg. 77790

Patent attorney

VENL LLC

Irvine, CA · 92610

626-376-6155

Jack Lo

Reg. 40070

Patent agent

Belmont, CA · 94002

650-557-6051

Nicholas Lo

Reg. 80243

Patent attorney

Morgan, Lewis & Bockius

Palo Alto, CA · 94304-1124

650-843-7861

Sze-Hang Lo

Reg. 48388

Patent attorney

Law Offices of S.H.Lo

Oakland, CA · 94612

510-788-0480

Thierry K Lo

Reg. 49097

Patent attorney

Schwegman Lundberg Woessner P.A.

Irvine, CA · 92618

949--35-4-0200

Joshua C Loader

Reg. 79308

Patent attorney

Redding, CA · 96002

530-262-4051

Stephen M Lobbin

Reg. 41159

Patent attorney

SML Avvocati P.C.

La Jolla, CA · 92037

949-636-1391

Kim C Lobring

Reg. 69253

Patent attorney

Sheppard Mullin Richter & Hampton LLP

San Diego, CA · 92130

858-720-7489

Samuel A. LoCascio

Reg. 81262

Patent agent

10x Genomics, Inc.

Pleasanton, CA · 94588

925-694-2476

Julie K Locke

Reg. 48663

Patent attorney

Gibson Dunn and Crutcher LLP

Los Angeles, CA · 90067

310-552-8692

Jean M Lockyer

Reg. 44879

Patent agent

Kilpatrick Townsend & Stockton LLP

San Francisco, CA · 94111

415-576-0200

Robert Lodenkamper

Reg. 55399

Patent agent

Lumen Patent Firm

Palo Alto, CA · 94301

650-331-8414

Peter M Loderup

Reg. 79839

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92630

714-830-0517

Gary H Loeb

Reg. 41160

Patent attorney

INTUITIVE SURGICAL , INC .

SUNNYVALE, CA · 94086

408-523-2100

Jonathan D Loeb

Reg. 44880

Patent attorney

Dechert LLP

Palo Alto, CA · 94306

650-813-4995

Keith T. K. Loebner

Reg. 76433

Patent agent

Palo Alto, CA · 94304

650-823-8064

Katja D Loeffelholz

Reg. 40768

Patent attorney

Dickenson Peatman & Fogarty

Napa, CA · 94559

707-252-7122

Christine F Loehrlein

Reg. 51012

Patent agent

Alza Corporation

Mountain View, CA · 94043

650-564-2691

April Charise Logan

Reg. 33950

Patent attorney

Solana Beach, CA · 92075

858-792-2491

Forrest Eugene Logan

Reg. 27352

Patent attorney

Law Office of F. Eugene Logan

Tustin, CA · 92780-3341

714-730-5553

Francis D. Logan

Reg. 68507

Patent attorney

Americhip, Inc.

Gardena, CA · 90248

310-323-3697

Jefferson K Logan

Reg. 40705

Patent attorney

Long Beach, CA · 90803

562-987-0119

Holly J. Logue

Reg. 47755

Patent attorney

LOGUE P.C.

San Francisco, CA · 94131

323-715-9950

Scott M Lohnes

Reg. 45451

Patent attorney

San Diego, CA · 92129

858-212-6640

Jason D Lohr

Reg. 48163

Patent attorney

Hogan Lovells US LLP

San Francisco, CA · 94111

415-374-2300

Trevor D. Lohrey

Reg. 80991

Patent agent

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94107

415-947-2089

Timothy W Lohse

Reg. 35255

Patent attorney

Manatt, Phelps & Phillips

Redwood City, CA · 94065

650-812-1307

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.