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 Sheppard, Mullin, Richter & Hampton LLP, Yu Yang Law Office, and SY Consultants.

Top cities in California

All practitioners in California

Yu Yang

Reg. 74853

Patent attorney

Yu Yang Law Office

Redlands, CA · 92375

909-435-1819

Jean Y.M Yang-Scharlotta

Reg. 64959

Patent agent

SY Consultants

La Canada, CA · 91011

408-829-2476

Leon R Yankwich

Reg. 30237

Patent attorney

Yankwich & Associates

Alameda, CA · 94501

617-842-8566

Daniel N Yannuzzi

Reg. 36727

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

858-720-8924

Joseph A Yanny

Reg. 29459

Patent attorney

Yanny and Smith

Los Angeles, CA · 90067

310-551-2966

Guhua Yao

Reg. 74854

Patent attorney

folsom, CA · 95630

408-649-9689

Joyce K. Yao

Reg. 84152

Patent attorney

San Francisco, CA · 94115

626-802-7561

Shun Yao

Reg. 59242

Patent attorney

Park, Vaughan & Fleming, LLP

Davis, CA · 95618

530-759-1667

Xiaoyi Yao

Reg. 67705

Patent attorney

Buena Park, CA · 90621

714-670-9389

Yi Yao

Reg. 69658

Patent attorney

DeHeng Law Offices

Pleasanton, CA · 94588

925-399-5856

Ying Yao

Reg. 800163

Limited recognition

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

858-720-7498

Yu Yao

Reg. 71924

Patent attorney

Los Altos, CA · 94022

650-796-3852

Zhen Yao

Reg. 75616

Patent agent

San Gabriel, CA · 91775

626-632-1436

Zhengzheng Yao

Reg. 73982

Patent agent

Arcus Biosciences

Hayward, CA · 94545

626-758-2370

Alex S Yap

Reg. 60609

Patent attorney

Morrison ^ Foerster LLP

Los Angeles, CA · 90017-3543

408-918-7605

Daniel K. Yarbrough

Reg. 70158

Patent attorney

Element Biosciences, Inc.

San Diego, CA · 92121

619-353-0300

Steven E. Yarger

Reg. 60420

Patent agent

San Francisco, CA · 94109

773-213-9471

Megan A Yarnall

Reg. 65745

Patent agent

Janssen, Malloy, Needham, Morrison, Reinholtsen. Crowley & Griego, LLP

Eureka, CA · 95503

707-445-2071

Daisy S Yau

Reg. 58691

Patent attorney

Oracle

Redwood Shores, CA · 94065

415-952-6262

Peggy C Yau

Reg. 76926

Patent agent

Los Angeles, CA · 90034

310-734-8812

Philip Yau

Reg. 32892

Patent agent

Davis Wright Tremaine, LLP

San Francisco, CA · 94111

415-276-6943

JoAnne M Ybaben

Reg. 42243

Patent attorney

Acacia Research Corporation

Newport Beach, CA · 92660

949-480-8334

Romeo Yee Ybanez

Reg. 54558

Patent agent

Pasadena, CA · 91116-6304

Feng Ye

Reg. 74324

Patent agent

Jones Day

San Diego, CA · 92121

858-314-1175

Gary Fu Ye

Reg. 59465

Patent agent

San Jose, CA · 95110

408-977-1504

Jing Ye

Reg. 66353

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3062

Qing Ye

Reg. 64657

Patent agent

Los Gatos, CA · 95032

518-428-4068

Hal R Yeager

Reg. 35419

Patent agent

Pleasant Hill, CA · 94523

415-971-4458

Pejman Yedidsion

Reg. 64812

Patent attorney

Brooks Acordia IP Law, P.C.

Westlake Village, CA · 91361

805-579-2500

Augustine G Yee

Reg. 42244

Patent attorney

San Diego, CA · 92128

858-485-5216

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.