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 Morgan Lewis & Bockius LLP, EE-Patent, and University of California, San Diego.

Top cities in California

All practitioners in California

Jonathan A Kidney

Reg. 46195

Patent attorney

EE-Patent

Solana Beach, CA · 92075

703-845-8066

Dannie Rae Kiel

Reg. 83301

Patent agent

Morgan Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-7288

Cynthia A Kikugawa

Reg. 40678

Patent attorney

Menlo Park, CA · 94026-0375

Yeokyoung Kil

Reg. 800165

Limited recognition

Morgan Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-7511

April E Kilburn

Reg. 51876

Patent agent

University of California, San Diego

LaJolla, CA · 92093-0910

858-822-1858

Neil P Kilcoin

Reg. 47705

Patent agent

Guava Technologies, Inc.

Hayward, CA · 94545

510-576-1409

Thomas Daniel Kiley

Reg. 24910

Patent attorney

Hillsborough, CA · 94010

650-348-6974

Laurel A Kilgour

Reg. 69429

Patent attorney

Comar Molle LLP

San Francisco, CA · 94115

415-562-6790

Brandon M Kilian

Reg. 77817

Patent attorney

Law Offices of Brandon Kilan

La Grange, CA · 95329

209-404-5135

Adrian H Kim

Reg. 53121

Patent attorney

San Francisco, CA · 94131

415-642-4933

Allen H Kim

Reg. 69814

Patent attorney

McDermott Will & Emery LLP

Irvine, CA · 92614-2559

949-757-6065

Andrew T. Kim

Reg. 70203

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Los Angeles, CA · 90071

213-617-4250

Anthony S H Kim

Reg. 67182

Patent attorney

Saildrone, Inc.

Alameda, CA · 94501

415-670-9700

Brian J. Kim

Reg. 74665

Patent attorney

Fish IP Law, LLP

Irvine, CA · 92614

949-943-8330

Brian Y. Kim

Reg. 84653

Patent attorney

Latham & Watkins LLP

San Francisco, CA · 94111

415-395-8093

Chang H Kim

Reg. 42727

Patent attorney

Palo Alto, CA · 94306

408-691-2455

Cheol Kim

Reg. 76594

Patent agent

QuantumScape Battery, Inc.

San Jose, CA · 95110

202-499-8997

Cy Chooyoun Kim

Reg. 53122

Patent attorney

Mountain View, CA · 94043

408-453-6149

Daniel S Kim

Reg. 51877

Patent attorney

Law Offices of Daniel S. Kim

Los Angeles, CA · 90010

213-282-8387

David S Kim

Reg. 57143

Patent agent

DK Milestone, LLC

Anaheim, CA · 92801

657-549-4542

David G. Kim

Reg. 73265

Patent attorney

Friedland Cianfrani LLP

Irvine, CA · 92614

949-734-7451

David Tawhee Kim

Reg. 74597

Patent attorney

Sheppard Mulin Richter & Hampton LLP

Palo Alto, CA · 94301

650-815-2600

Do Hee Kim

Reg. 64300

Patent agent

WTA Patents

Santa Clara, CA · 95054

650-547-5457

Dongyul Kim

Reg. 57048

Patent attorney

Perkins Coie LLP

Menlo Park, CA · 94025

650-838-4387

Emil Kim

Reg. 48284

Patent attorney

Camarillo, CA · 93012

805-383-7506

Eric J Kim

Reg. 71483

Patent attorney

PayPal Inc.

San Jose, CA · 95131

408-967-5259

Esther Kim

Reg. 62838

Patent attorney

Morrison & Foerster LLP

San Francisco, CA · 94105

415-268-7562

Esther E. Kim

Reg. 76454

Patent attorney

Arcadia, CA · 91066

915-637-3480

Eugene G Kim

Reg. 46267

Patent attorney

Twilio Inc.

San Francisco, CA · 94105

605-366-1024

Frederick Dong Kim

Reg. 38513

Patent attorney

Kim & Stewart LLP

San Jose, CA · 95113

650-380-9760

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.