California

Patent attorneys in California

California hosts 9,567 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 Arcadia Science, Folger Levin and Kahn LLP, and Keller Patent and Trademark Law.

Top cities in California

All practitioners in California

Kathleen R. Kelleher

Reg. 62230

Patent attorney

Arcadia Science

Berkeley, CA · 94705

510-788-1110

Michael F Kelleher

Reg. 55321

Patent attorney

Folger Levin and Kahn LLP

San Francisco, CA · 94111

415-986-2800

Caroline L Keller

Reg. 50491

Patent attorney

Keller Patent and Trademark Law

Manhattan Beach, CA · 90266

310-372-2171

Lauren J Keller

Reg. 56553

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-721-6365

Christopher L Kelley

Reg. 42714

Patent attorney

Perkins Coie, LLP

Palo Alto, CA · 94304

650-838-4452

James L Kelley

Reg. 42715

Patent agent

Manhattan Beach, CA · 90266

310-318-2904

Sarita R Kelley

Reg. 50850

Patent agent

Chevron Corporation

San Ramon, CA · 94583-2324

Scott Wayne Kelley

Reg. 30762

Patent attorney

Kelly & Kelley, LLP

Woodland Hills, CA · 91367

818-347-7900

David C Kellogg

Reg. 62958

Patent attorney

Dolby Laboratories, Inc.

San Francisco, CA · 94103

415-645-5835

Eric A Kelly

Reg. 70302

Patent attorney

Fontana, CA · 92336

310-486-2698

Gianna G Kelly

Reg. 57922

Patent agent

Sonoma, CA · 95476

707-935-6100

Gilbert T. Kelly

Reg. 70988

Patent agent

Medlen & Carroll, LLP

Oakland, CA · 94612

469-454-4259

Kevin T Kelly

Reg. 64158

Patent attorney

Imperial County District Attorney's Office

El Centro, CA · 92243

310-709-5935

Mary E. Kelly

Reg. 78195

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3337

Peter M Kelly

Reg. 51282

Patent attorney

Peter M Kelly

Seal Beach, CA · 90740-1460

714-306-4223

Robert Stanley Kelly

Reg. 25278

Patent attorney

Saratoga, CA · 95070

408-867-5648

Casie A Kelly-Quintos

Reg. 60593

Patent agent

UCI Office of Technology Alliances

Irvine, CA · 92697-7700

949-824-2920

David K Kempe

Reg. 78701

Patent agent

Morrison and Foerster, LLP

Palo Alto, CA · 94304

918-728-9228

Casey H. Kempner

Reg. 74516

Patent attorney

P&P Imports LLC

Irvine, CA · 92614

650-488-8270

Mark R Kendrick

Reg. 48468

Patent agent

Kendrick Intellectual Property Law

Sherman Oaks, CA · 91403

818-905-3211

Karl Kenna

Reg. 45445

Patent agent

Tucker Ellis LLP

San Francisco, CA · 94105

415-617-2400

Bill Kennedy

Reg. 33407

Patent attorney

Bill Kennedy Patents

Half Moon Bay, CA · 94019

650-703-8074

Kimberly A. Kennedy

Reg. 82055

Patent attorney

Kobre & Kim LLP

San Francisco, CA · 94111

415-582-4800

Patrick Michael Kennedy

Reg. 77344

Patent attorney

Mozilla Corporation

San Mateo, CA · 94105

402-881-0492

Roger P Kennedy

Reg. 44823

Patent attorney

The Walt Disney Corp

Burbank, CA · 91521

818-560-2723

Ryan B Kennedy

Reg. 48590

Patent agent

Run8 Patent Group

San Francisco, CA · 94103

415-579-5520

Troy A Kennedy

Reg. 61492

Patent attorney

Costa Mesa, CA · 92626

646-522-4759

Julia Kennedy-Darling

Reg. 81877

Patent agent

Redwood City, CA · 94061

503-704-0070

Christopher W Kennerly

Reg. 40675

Patent attorney

Paul Hasting LLP

Palo Alto, CA · 94304

650-320-1800

Christopher J Kenney

Reg. 50619

Patent agent

Menlo Park, CA · 94025

650-854-8154

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?

9,567 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.