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 Wilson Sonsini Goodrich & Rosati, The Litovsky Law Firm, and FENWICK & WEST LLP.

Top cities in California

All practitioners in California

Charles J Lisherness

Reg. 64778

Patent attorney

Cardiff, CA · 92007

760-634-3793

William F Liskow· III

Reg. 51256

Patent agent

Laguna Hills, CA · 92653

Charles P Litchfield

Reg. 68913

Patent attorney

San Rafael, CA · 94901

415-526-6333

Craig M. Litherland

Reg. 73457

Patent agent

San Jose, CA · 95138

650-380-0748

Alina L Litoshyk

Reg. 71960

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2369

Allan Z Litovsky

Reg. 40249

Patent attorney

The Litovsky Law Firm

Huntington Beach, CA · 92648

323-375-8008

Isaac J. Little

Reg. 84030

Patent agent

FENWICK & WEST LLP

Mountain View, CA · 94041

650-335-4948

Otis B Littlefield

Reg. 48751

Patent attorney

Morrison and Foerster LLP

San Francisco, CA · 94105

415-268-6846

Seth Forestier Littleford

Reg. 81829

Patent agent

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-646-2576

Paul B Littlepage

Reg. 48581

Patent attorney

Ben Lomond, CA · 95005

415-407-0538

Adam W Littman

Reg. 61014

Patent attorney

Adeli LLP

Los Angeles, CA · 90025

310-442-9300

Robert G Litts

Reg. 46876

Patent attorney

Candescent Law Group

Burlingame, CA · 94010

925-644-1102

Emmett J Litvak

Reg. 80919

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Agatha H. Liu

Reg. 65323

Patent attorney

Duane Morris LLP

Palo Alto, CA · 94301

650-847-4174

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

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.