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 One LLP, BioMarin Pharmaceutical Inc., and Pillsbury Winthrop Shaw Pittman LLP.

Top cities in California

All practitioners in California

Ben Hsiao-Pang Liu

Reg. 69525

Patent agent

Hayward, CA · 94541

510-862-8149

Bin Liu

Reg. 57299

Patent agent

San Diego, CA · 92130

858-699-4653

Bowen Liu

Reg. 71260

Patent agent

BioMarin Pharmaceutical Inc.

Novato, CA · 94949

415-506-6700

Charles C Liu

Reg. 53226

Patent agent

Thousand Oaks, CA · 91320

Chiahow M Liu

Reg. 77133

Patent agent

Pillsbury Winthrop Shaw Pittman LLP

Palo Alto, CA 94304, CA · 94304-1115

650-233-4525

Cliff Z Liu

Reg. 50834

Patent attorney

Cooley Godward LLP

Palo Alto, CA · 94306

650-843-5852

Dan Liu

Reg. 69291

Patent attorney

Loeb & Loeb LLP

Los Angeles, CA · 90067

310-282-2179

Dongxia Liu

Reg. 78573

Patent agent

Trademarkia Inc.

Mountain View, CA · 94040

650-681-7734

Glen Liu

Reg. 75058

Patent attorney

One LLP

Newport Beach, CA · 92660

949-432-9993

Grace Liu

Reg. 83604

Patent agent

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94105-1126

628-233-9373

Grace I Liu

Reg. 58190

Patent agent

California State University, Fresno

Fresno, CA · 93726-1852

559-278-1857

Hanchen Liu

Reg. 83900

Patent agent

Concord & Sage PC

Diamond Bar, CA · 91765

619-732-6858

Helen Liu

Reg. 69780

Patent attorney

Millbrae, CA · 94030

909-319-3887

Henry Y Liu

Reg. 60147

Patent agent

Cupertino, CA · 95014

408-446-3739

Hongming Liu

Reg. 74168

Patent attorney

Tencent America LLC

Palo Alto, CA · 94301

312-656-3616

Hsin Hsin Liu

Reg. 51954

Patent attorney

Fremont, CA · 94538

510-936-1908

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

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.