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 ScienBiziP, PC, Knobble Martens Olson & Bear LLP, and Finnegan, Henderson, Farabow, Garrett & Dunner, LLP.

Top cities in California

All practitioners in California

Kelvin K. F. Liu

Reg. 73932

Patent agent

ScienBiziP, PC

Los Angeles, CA · 90071

213-426-1784

Lequn Liu

Reg. 77285

Patent agent

San Jose, CA · 95138

803-466-6506

Linda H Liu

Reg. 51240

Patent attorney

Knobble Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Lu Liu

Reg. 81723

Patent agent

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304

650-512-3540

Margaret Liu

Reg. 83378

Patent agent

Davis, CA · 95616

530-407-7734

Paul Y Liu

Reg. 65971

Patent attorney

TuSimple, Inc.

San Diego, CA · 92122

619-916-3144

Peter T Liu

Reg. 61590

Patent agent

Castro Valley, CA · 94552

510-889-9281

Qian Liu

Reg. 67449

Patent agent

Los Gatos, CA · 95032

408-598-0736

Qun Liu

Reg. 55392

Patent attorney

Qun Liu

Walnut Creek, CA · 94597

415-954-0200

Rong Liu

Reg. 63066

Patent attorney

Kilpatrick Townsend & Stockton LLP

San Francisco, CA · 94111

415-273-4318

Shuo Liu

Reg. 83761

Patent attorney

Fish IP Law LLP

Irvine, CA · 92612

949-943-8327

Sijia Liu

Reg. 84344

Patent agent

Daly City, CA · 94015

919-996-0728

Victor Liu

Reg. 70880

Patent agent

Dentons US LLP

Palo Alto, CA · 94304

Wen Liu

Reg. 32822

Patent attorney

LIU & LIU

Hacienda Heights, CA · 91745

213-830-5743

Xiao Liu

Reg. 83269

Patent agent

Morrison Foerster

Palo Alto, CA · 94304

650-813-4226

Xiao J Liu

Reg. 64030

Patent agent

Orange, CA · 92867

714-926-5086

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

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

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.