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 Irell and Manella LLP, Invitrogen Corporation, and Chen Yoshimura LLP.

Top cities in California

All practitioners in California

Campbell A. Yore

Reg. 73947

Patent agent

Berkeley, CA · 94703

864-421-5784

Ben Joseph Yorks

Reg. 33609

Patent attorney

Irell and Manella LLP

Newport Beach, CA · 92660

949-760-0991

Katsuji Yoshida

Reg. 68991

Patent agent

Irvine, CA · 92614

949-387-2468

Robert A Yoshida

Reg. 54941

Patent agent

Invitrogen Corporation

Carlsbad, CA · 92008

760-268-8351

Joanne Yoshimura

Reg. 45247

Patent attorney

Moraga, CA · 94556

925-235-9760

Masao Yoshimura

Reg. 52526

Patent attorney

Chen Yoshimura LLP

Santa Clara, CA · 95054

408-753-1130

Robert M. Yost

Reg. 71578

Patent attorney

Visa, Inc.

San Francisco, CA · 94105

415-805-4000

Jeff M. Yostanto

Reg. 81529

Patent attorney

Goe Forsythe & Hodges LLP

Irvine, CA · 92614

949-798-2460

Yuying You

Reg. 77034

Patent attorney

Morrison Foerster LLP

Palo Alto, CA · 94306

205-240-2417

Alan W Young

Reg. 37970

Patent attorney

Young Law Firm, P.C.

Portola Valley, CA · 94028

650-851-7210

Barry Norman Young

Reg. 27744

Patent attorney

Law Offices of Barry N. Young

Palo Alto, CA · 94306

650-326-2701

Brian Nathaniel Young

Reg. 48602

Patent attorney

Fountainhead Law Group P.C.

Santa Clara, CA · 95050

415-335-6456

Brittany F. Young

Reg. 79758

Patent agent

San Francisco, CA · 94115

408-394-3198

Charles K Young

Reg. 39435

Patent attorney

Cathedral City, CA · 92234

760-898-0935

Diana S. Young

Reg. 59680

Patent attorney

Elastic Projects, Inc. dba Abstract

San Francisco, CA · 94102

415-857-1593

Lydia J Young

Reg. 64427

Patent agent

Palo Alto, CA · 94303

650-493-7077

Roberta A Young

Reg. 53818

Patent attorney

Jaquez, Land, Greenhaus & McFarland

San Diego, CA · 92121

442-349-7560

Rowena Y Young

Reg. 47199

Patent attorney

Finjan Holdings, Inc

East Palo Alto, CA · 94303

650-492-6540

Samantha A. Young

Reg. 81142

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

858-720-7459

Timothy J. Young

Reg. 58705

Patent attorney

Morrison & Foerster, LLP

San Francisco, CA · 94105-2482

415-268-7674

Travis G. Young

Reg. 53819

Patent attorney

BOZICEVIC, FIELD & FRANCIS LLP

Redwood City, CA · 94065

650-327-3400

Trevor M. Young

Reg. 70089

Patent attorney

Sacramento, CA · 95834

831-539-9078

Wallace H. Young

Reg. 61181

Patent agent

San Mateo, CA · 94402

650-888-2801

James Eugene Youngblood

Reg. 66092

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-721-2916

Andrew Kenneth Youngs

Reg. 45250

Patent agent

Andrew K. Youngs

Antelope, CA · 95843

408-464-0660

Joel Darrell Youngs

Reg. 52389

Patent attorney

Wagner Blecher LLP

Watsonville, CA · 95076

408-377-0500

Karen Lynn Younkins

Reg. 67554

Patent attorney

Hueston Hennigan LLP

Los Angeles, CA · 90014

301-514-5376

Steven Ray Yount

Reg. 43692

Patent attorney

Roseville, CA · 95747

916-771-4439

Mohamed A Youssef

Reg. 71692

Patent attorney

Santa Clarita, CA · 91350

310-365-6550

David Hadi Youssefi

Reg. 44002

Patent attorney

Sony Online Entertainment LLC

San Diego, CA · 92121

858-577-3338

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.