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 Knobbe, Martens, Olson & Bear, LLP, Wilson Sonsini Goodrich & Rosati, and Rivian Automotive.

Top cities in California

All practitioners in California

Sophia F. Zahn

Reg. 81756

Patent agent

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

914-792-8066

Ashraf A Zahr

Reg. 63678

Patent attorney

Rivian Automotive

Irvine, CA · 92606

888-748-4261

Justin W. Zahrt

Reg. 55754

Patent attorney

Stanford Office of Technology Licensing

Redwood City, CA · 94063

650-725-9408

Eric G Zaiser

Reg. 58352

Patent attorney

Google, Inc.

Mountain View, CA · 94043

650-605-5553

Oleh J. Zajac

Reg. 63234

Patent agent

Alfred E. Mann Foundation for Scientific

Santa Clarita, CA · 91380

661-702-6773

William J Zak· Jr

Reg. 38668

Patent attorney

Honeywell International Inc.

Torrance, CA · 90504

310-512-4885

Michael Zakharian

Reg. 83752

Patent agent

Santa Monica, CA · 90401

818-751-9757

Marina V Zalevsky

Reg. 53825

Patent attorney

KILPATRICK TOWNSEND AND STOCKMAN

Los Angeles, CA · 90067

310-966-4916

Gary Zalewski

Reg. 51068

Patent agent

Sony Computer Entertainment America Inc.

Foster City, CA · 94404

650-655-8000

Mehdi Zamanpour

Reg. 77241

Patent agent

AZ IP LLC

Newport Beach, CA · 92660

949-954-3252

Lisa D Zang

Reg. 70279

Patent attorney

Wilson Sonsini Goodrich & Rosati

Los Angeles, CA · 90061

323-210-2923

Qin Zang

Reg. 83280

Patent agent

Thousand Oaks, CA · 91362

307-399-5426

Jennifer A Zanocco

Reg. 54563

Patent attorney

Google Inc.

Mountain View, CA · 94043

James R. Zantos

Reg. 81416

Patent agent

Santa Ana, CA · 92705

714-420-2354

William A Zarbis

Reg. 46120

Patent agent

Murabito Hao and Barnes LLP

San Jose, CA · 95113

408-938-9060

Nima Zargari

Reg. 79740

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2300

Brian S Zark

Reg. 74725

Patent attorney

San Diego, CA · 92124

310-374-6000

Michael Zarrabian

Reg. 39886

Patent attorney

Brooks Acordia IP Law, P.C

Westlake Village, CA · 91361

805-579-2500

Aviya Zarur

Reg. 81801

Patent attorney

Kilpatrick Townsend & Stockton LLP

Los Angeles, CA · 90067

310-777-3746

Sofia Zaslavsky

Reg. 44462

Patent attorney

Mountain View, CA · 94040

650-327-2120

A Stephen Zavell

Reg. 28050

Patent attorney

Chevron U.S.A. Inc.

San Ramon, CA · 94583-2324

925-842-1873

Hitisha Praveen Zaveri

Reg. L1170

Limited recognition

Gilead Sciences

Foster City, CA · 94404

650-653-2075

Mark J Zavislak

Reg. 68570

Patent attorney

Cupertino, CA · 95015

415-326-3622

Peter S Zawilski

Reg. 43305

Patent agent

Luminous Cyber Corporation

San Jose, CA · 95131

408-675-2995

Nicole A Zeinstra

Reg. 81679

Patent agent

Palo Alto, CA · 94304

650-461-7386

Alexey Zelditch

Reg. 45293

Patent agent

Apple Computer

Cupertino, CA · 95014

408-974-0516

Thomas C Zeleny

Reg. 42249

Patent attorney

San Diego City Attorney's Office

San Diego, CA · 92101

619-236-7728

Boris Zelkind

Reg. 42250

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

San Diego, CA · 92130

858-707-4000

Keon K Zemoudeh

Reg. 80006

Patent attorney

Davis Polk & Wardwell LLP

Menlo Park, CA · 94025

949-616-2813

Alexander D Zeng

Reg. 73564

Patent attorney

Knobbe Martens

Irvine, CA · 92614

949-721-5293

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.