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 Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C, McDermott Will & Schulte LLP, and Orrick Herrington & Sutcliffe, LLP.

Top cities in California

All practitioners in California

Yanyi Liu

Reg. 71046

Patent attorney

Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C

San Francisco, CA · 94104

415-432-6013

Yao Liu

Reg. 72952

Patent agent

Irvine, CA · 92620

949-232-9887

Yi Liu

Reg. 81633

Patent agent

San Jose, CA · 95131

218-296-6160

Yiling A. Liu

Reg. 83247

Patent agent

Irvine, CA · 92617

424-409-1237

Ying-Horng Liu

Reg. 60012

Patent attorney

Davis, CA · 95616

314-223-1639

Yuhe Liu

Reg. 76525

Patent attorney

McDermott Will & Schulte LLP

San Diego, CA · 92130

619-625-6313

Zheng Liu

Reg. 58672

Patent attorney

Orrick Herrington & Sutcliffe, LLP

Menlo Park, CA · 94025

650-614-7699

Zheng Liu

Reg. 68406

Patent attorney

Aptum Law

Foster city, CA · 94404

650-475-6289

Zhengya Liu

Reg. 83445

Patent agent

San Francisco, CA · 94158-2367

415-200-1919

Eric M Livak Hale

Reg. 74790

Patent attorney

EdenRoc Sciences, LLC

Scotts Valley, CA · 95066

510-220-0923

Paul O Livesay

Reg. 39752

Patent attorney

San Carlos, CA · 94070

650-255-1818

John H Livingston

Reg. 44876

Patent agent

Newport Beach, CA · 92660

949-644-7590

Andrew W. Lloyd

Reg. 66766

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Matthew J Lloyd

Reg. 51960

Patent agent

Underwiters Laboratories INC

San Diego, CA · 92107

858-496-0112 X106

Allen M Lo

Reg. 37059

Patent agent

Google INC.

Mountain View, CA · 94043

650-253-5564

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

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.