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 Canon U.S.A., Inc., RPX Corporation, and Knobbe Martens Olson & Bear, LLP.

Top cities in California

All practitioners in California

Trevor Chuang

Reg. 55073

Patent agent

Canon U.S.A., Inc.

Irvine, CA · 92612

949-932-3216

William W Chuang

Reg. 39635

Patent attorney

RPX Corporation

San Francisco, CA · 94105

415-418-2544

Amy C Chun

Reg. 52742

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Debra A Chun

Reg. 38700

Patent agent

Mountain View, CA · 94043

650-386-7888

Jennifer K. Chun

Reg. 78018

Patent agent

El Dorado Hills, CA · 95762

916-933-6693

Ricky K Chun

Reg. 63371

Patent attorney

Broadcom Corporation

Irvine, CA · 92617

949-926-7803

Ryan J Chun

Reg. 54037

Patent agent

San Jose, CA · 95131

408-892-3119

Chang Jay Y Chung

Reg. 71007

Patent attorney

Russ August & Kabat

Los Angeles, CA · 90025

310-826-7474

Christian M G Chung

Reg. 63722

Patent attorney

Northridge, CA · 91343

818-481-3456

Daniel W Chung

Reg. 69065

Patent agent

San Jose, CA · 95129

412-512-2715

David D Chung

Reg. 38409

Patent attorney

Walnut Creek, CA · 94598

408-828-4198

Dong J Chung

Reg. 41678

Patent attorney

ARCADIA, CA · 91006

626-578-7777

Howard E. Chung

Reg. 59800

Patent attorney

Irvine, CA · 92602

Jaysen S Chung

Reg. 68199

Patent attorney

Gibson, Dunn & Crutcher LLP

San Francisco, CA · 94111

415-393-8271

Matthew Chung

Reg. 77462

Patent agent

San Francisco, CA · 94104

415-875-5749

Ruby L Chung

Reg. 76809

Patent attorney

Polsinelli LLP

San Francisco, CA · 94111

415-248-2102

Tae Gyun Chung

Reg. 78252

Patent agent

Garden Grove, CA · 92842

714-823-7124

Tsoi Ling Chung

Reg. 81014

Patent agent

California Institute for Quantitative Biosciences

Berkeley, CA · 94720-3220

510-666-3308

Woo K Chung

Reg. 71287

Patent agent

Redwood Mercury Lab

Redwood City, CA · 94063

650-780-3168

Shirley L Church

Reg. 31858

Patent attorney

Encinitas, CA · 92024

408-499-4709

Stephen John Church

Reg. 29522

Patent attorney

Ridgecrest, CA · 93555

760-375-6492

Dargaye Habte Churnet

Reg. 71288

Patent attorney

Fenwick & West LLP

San Francisco, CA · 94104

415-875-2300

James Jeng-Yang Chyau

Reg. 65359

Patent agent

San Gabriel, CA · 91776

626-386-3801

Chaney Edmund Cieck

Reg. 52749

Patent attorney

Calabasas, CA · 91302

310-922-0647

John A. Cifelli

Reg. 81907

Patent attorney

Birdrock IP

La Jolla, CA · 92037

858-214-6282

Marin P. Cionca

Reg. 63899

Patent attorney

CIONCA Law Group P.C.

Irvine, CA · 92614

800-454-1360

Mark P.A. Ciotola

Reg. 83435

Patent attorney

Moffett Field, CA · 94035

415-987-9180

Thomas Edward Ciotti

Reg. 21013

Patent attorney

Morrison & Foerster LLP

Palo Alto, CA · 94304

650-813-5702

Frank L Cire

Reg. 42419

Patent agent

Gamblit Gaming, LLC

Glendale, CA · 91203

626-221-5465

Evan P. Cirves

Reg. 84629

Patent agent

Davis, CA · 95616

925-858-6097

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.