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 Nixon Peabody LLP, Plexxikon Inc., and Sidley Austin LLP.

Top cities in California

All practitioners in California

Suwei Zhu

Reg. 75260

Patent agent

Nixon Peabody LLP

Los Angeles, CA · 90071

213-629-6093

Wei Zhu

Reg. 74726

Patent attorney

Thousand Oaks, CA · 91320

805-447-1000

Yi Zhu

Reg. 83029

Patent agent

Yorba Linda, CA · 92887

626-509-0137

Yong Liang Zhu

Reg. 56714

Patent agent

Plexxikon Inc.

Berkeley, CA · 94710

510-647-4028

Binquan Zhuang

Reg. 73888

Patent agent

Sidley Austin LLP

Palo Alto, CA · 94304

650-565-7084

Bryan C Zielinski

Reg. 34462

Patent attorney

Pfizer Inc

San Diego, CA · 92121

858-755-5925

Emilia A. Zielinski

Reg. 82858

Patent agent

Olivo IP Group, Inc.

Beverly Hills, CA · 90210

310-562-1222

John M Zigmant

Reg. 44005

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

San Francisco, CA · 94111

415-576-0200

Kevin J Zilka

Reg. 41429

Patent attorney

Zilka - Kotab, PC

San Jose, CA · 95112

408-971-2573

Stefanie M Zilka

Reg. 45929

Patent attorney

Zilka-Kotab, P.C.

San Jose, CA · 95112

408-971-2573

Gergely T Zimanyi

Reg. 45754

Patent agent

LenSx Lasers Inc.

Emeryville, CA · 94608

530-400-3936

Kevin J Zimmer

Reg. 36977

Patent attorney

IKIN Inc.

San Diego, CA · 92122

858-945-8634

Olga Kay Zimmerman

Reg. 57459

Patent attorney

Caribou Biosciences, Inc.

Berkeley, CA · 94710

925-366-0507

Thomas D Zindrick

Reg. 32185

Patent attorney

Conexis

Irvine, CA · 92618

949-360-1880

Michael J Zingale

Reg. 58431

Patent attorney

Stetina, Brunda, Garred and Brucker

Aliso Viejo, CA · 92656

949-855-1246

Gregory M Zinkl

Reg. 48492

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

650-922-2382

Michelle J Ziperstein

Reg. 75143

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

310-407-3475

Brett E. Zirkle

Reg. 77124

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130-3002

858-350-2377

Matthew Scott Zises

Reg. 47246

Patent attorney

Splunk, Inc.

San Francisco, CA · 94107

415-852-5861

Bruce R Zisser

Reg. 40884

Patent attorney

Manatt, Phelps & Phillips LLP

Los Angeles, CA · 90067

310-312-4126

Maya Ziv

Reg. 74676

Patent attorney

Latham & Watkins, LLP

Menlo Park, CA · 94025

650-470-2171

Ognjen Zivojnovic

Reg. 69516

Patent agent

San Francisco, CA · 94109

949-293-0884

Thomas Martin Zlogar

Reg. 55760

Patent attorney

San Mateo, CA · 94402

650-235-5252

Jacob S Zodieru

Reg. 72352

Patent attorney

ArentFox Schiff LLP

Los Angeles, CA · 90071

213-443-7655

David J Zoetewey

Reg. 45258

Patent attorney

Teledyne

Thousand Oaks, CA · 91360

805-373-4244

Nerrie M Zohn

Reg. 55761

Patent attorney

Qualcomm Inc.

San Diego, CA · 92121

858-651-9704

Narek Zohrabyan

Reg. 74925

Patent attorney

Phil IP Law Inc.

Glendale, CA · 91203

619-929-0606

Geri T Zollinger

Reg. 45259

Patent attorney

Irvine, CA · 92612

Andrew B Zoltan

Reg. 64929

Patent attorney

BridgeBio Pharma, Inc.

Palo Alto, CA · 94304

202-641-2269

Catalin S. Zonte

Reg. 71582

Patent attorney

White & Case LLP

Los Angeles, CA · 90071

213-620-7798

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.