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 Hybrid Law Group PC, Antheros Legal Advisors LLP, and Morgan, Lewis & Bockius LLP.

Top cities in California

All practitioners in California

Mikael Havluciyan

Reg. 47285

Patent attorney

Hybrid Law Group PC

San Diego, CA · 92101

619-990-5248

Kristin J. Havranek

Reg. 58789

Patent attorney

Antheros Legal Advisors LLP

San Diego, CA · 92212

858-275-8656

James E Hawes

Reg. 19680

Patent attorney

Norwalk, CA · 90650

760-220-2603

Brent A Hawkins

Reg. 44146

Patent attorney

Morgan, Lewis & Bockius LLP

San Francisco, CA · 94105-1596

415-442-1000

David C Hawkins

Reg. 76932

Patent agent

Kubota and Basol

Los Angeles, CA · 90071

213-280-4291

Philip E. Hawkyard

Reg. 81629

Patent agent

Concord, CA · 94521

925-787-2857

Emma L Hawley

Reg. 82298

Patent agent

San Diego, CA · 92122

920-366-4936

Joel J Hayashida

Reg. 30065

Patent attorney

San Francisco, CA · 94132

415-648-2880

Amy E. Hayden

Reg. 64817

Patent attorney

Russ, August & Kabat

Los Angeles, CA · 90025

310-826-7474

Robert D Hayden

Reg. 42645

Patent attorney

Rimon, PC

Menio Park, CA · 94025

650-461-4433

Nancy Haydt

Reg. 39217

Patent attorney

Law Office of Nancy Haydt

Ventura, CA · 93001

805-637-1061

Darlene Wendy Hayes

Reg. 33899

Patent attorney

Sebastopol, CA · 95444

707-474-7817

David Lloyd Hayes

Reg. 34838

Patent attorney

Fenwick and West LLP

Mountain View, CA · 94041

415-875-2411

Jeanine L Hayes

Reg. 44752

Patent attorney

Overture (Yahoo!)

Pasadena, CA · 91103

626-685-5600

Jennifer Hayes

Reg. 50845

Patent attorney

Nixon Peabody LLP

Palo Alto, CA · 94306

650-320-7725

Philip Hindley Haymond

Reg. 38177

Patent attorney

Law Offices Philip H. Haymond

Irvine, CA · 92618-2933

949-623-8765

Mark A Haynes

Reg. 30846

Patent attorney

Haynes Beffel & Wolfeld LLP

Half Moon Bay, CA · 94019

650-712-0340

William L Haynes

Reg. 48151

Patent attorney

Medtronic Vascular, Inc.

Santa Rosa, CA · 95403

707-543-5484

Andrew W. Hays

Reg. 75784

Patent agent

Harbor Freight Tools USA, Inc.

Calabasas, CA · 93004

818-850-9696

Roman S. Hays

Reg. 83373

Patent agent

Costa Mesa, CA · 92627

949-878-1429

John N Hazelwood

Reg. 18796

Patent attorney

Nevada City, CA · 95959

560-265-4434

George Z He

Reg. 77317

Patent agent

George He

Sunnyvale, CA · 94087

408-731-0123

Jiayue He

Reg. 81843

Patent attorney

Wilson Sonsini Goodrich & Rosati

Los Angeles, CA · 90071

213-361-9535

Mingkang He

Reg. 800151

Limited recognition

Fish & Richardson P.C.

Redwood City, CA · 94063

650-839-5079

Panqing He

Reg. 53007

Patent agent

ChemEOR, Inc.

Covina, CA · 91722

626-858-5077

Shanshan He

Reg. 73870

Patent attorney

Jones Day

San Diego, CA · 92121

858-314-1154

Tianyi He

Reg. 76027

Patent agent

Treyz Law Group, P.C.

San Francisco, CA · 94102

415-404-6088

Xiang He

Reg. 66360

Patent agent

Fremont, CA · 94555

415-533-1188

Xiao He

Reg. 70646

Patent agent

Foster City, CA · 94404

650-766-2904

John Thomas Headlee

Reg. 25985

Patent attorney

Sacramento, CA · 95831

916-391-5266

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.