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 Huanhoo LLC, Artegis Law Group, and Kenja IP Law PC.

Top cities in California

All practitioners in California

Huilu Liu

Reg. 69574

Patent agent

San Jose, CA · 95132

510-778-3687

Isaac F Liu

Reg. 54640

Patent agent

Huanhoo LLC

San Jose, CA · 95129

408-655-7386

Jason J Liu

Reg. 69292

Patent attorney

Artegis Law Group

Sunnyvale, CA · 94085

832-356-0441

Jiameng K Liu

Reg. 65495

Patent attorney

Kenja IP Law PC

San Jose, CA · 95113

650-561-4758

Jiangqiong Liu

Reg. 72362

Patent attorney

Gilead Science

Foster City, CA · 94404

650-574-3000

Jiaping Liu

Reg. 71506

Patent agent

Haynes and Boone LLP

Palo Alto, CA · 94301

650-687-8805

Jing Liu

Reg. 62377

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

858-720-8950

Joe C. Liu

Reg. 61106

Patent attorney

Jones day

Palo Alto, CA · 94303

650-739-3900

John K Liu

Reg. 51956

Patent attorney

Mountain View, CA · 94043

650-967-3988

Jonathan W. Liu

Reg. 66210

Patent agent

Redwood City, CA · 94063

408-838-2110

Joseph K Liu

Reg. 51957

Patent attorney

One LLP

Newport Beach, CA · 92660

949-502-2875

Jun Liu

Reg. 70266

Patent agent

Milpitas, CA · 95035

408-329-3957

Justin Liu

Reg. 51959

Patent attorney

Synopsys, Inc.

Mountain View, CA · 94043

650-584-8586

Ke Liu

Reg. 73022

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-658-5218

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 J Liu

Reg. 64030

Patent agent

Orange, CA · 92867

714-926-5086

Xiao Liu

Reg. 83269

Patent agent

Morrison Foerster

Palo Alto, CA · 94304

650-813-4226

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.