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 Seyfarth Shaw LLP, Qualcomm INC, and Microsoft.

Top cities in California

All practitioners in California

Nancy R Chawla

Reg. 74843

Patent attorney

Seyfarth Shaw LLP

Century City, CA · 90067

310-201-5284

Joleen S. Cheah

Reg. 83075

Patent agent

San Jose, CA · 95127

408-594-8945

Wei Sern Cheah

Reg. 75275

Patent attorney

Los Angeles, CA · 90048

510-301-7136

Kevin T Cheatham

Reg. 48766

Patent attorney

Qualcomm INC

San Diego, CA · 92121

858-845-8450

Fehmi Chebil

Reg. 74182

Patent agent

Microsoft

Mountain View, CA · 94043

469-499-6743

Robert S Chee

Reg. 58554

Patent attorney

SAP Labs, LLC

Palo Alto, CA · 94304

Samantha N. Cheeks

Reg. 82654

Patent agent

Rialto, CA · 92377

909-688-9584

Alan M Chen

Reg. 62818

Patent attorney

Mountain View, CA · 94040

469-443-6201

Alexander C Chen

Reg. 45591

Patent attorney

La Canada-Flintridge, CA · 91011

Alexander Y Chen

Reg. 62315

Patent attorney

San Diego, CA · 92121

858-457-4556

Alexander Chen

Reg. 60031

Patent attorney

Irvine, CA · 92618

714-932-6659

Andrew B Chen

Reg. 48508

Patent attorney

LKP Global Law, LLP

Los Angeles, CA · 90067

424-239-1890

Andrew C Chen

Reg. 43544

Patent agent

Yahoo! Inc.

San Francisco, CA · 94111

415-262-7066

Aubrey Y Chen

Reg. 68753

Patent agent

Cupertino, CA · 95014

408-568-6305

Bernice B Chen

Reg. 42403

Patent attorney

Synaptics Incorporated

San Jose, CA · 95131

408-904-1100

Bob B H Chen

Reg. 77337

Patent attorney

Paul Hastings LLP

San Diego, CA · 92121

510-364-7054

Che Yang Chen

Reg. 64015

Patent attorney

Law Office of Michael Chen

Diamond Bar, CA · 91765

626-225-6295

Ching-Yang Chen

Reg. 70614

Patent agent

Duane Morris LLP

San Diego, CA · 92101

619-744-2263

Chun-Nan Chen

Reg. 56322

Patent agent

Alacragen LLC

San Jose, CA · 95129

408-799-7204

Diana Chen

Reg. 56947

Patent attorney

Daly City, CA · 94015

310-878-2820

Doris H Chen

Reg. 52724

Patent attorney

WebJuice, LLC

Mountain View, CA · 94040

650-314-7424

Duo Chen

Reg. 54028

Patent attorney

Box Inc.

Los Altos, CA · 94022

650-506-9076

Eric S Chen

Reg. 43542

Patent attorney

HRL Laboratories, LLC

Malibu, CA · 90265

310-317-5366

Fang Chen

Reg. 70467

Patent agent

Perkins Cole LLP

San Diego, CA · 92130-3334

858-720-5708

George Chen

Reg. 50807

Patent agent

Los Gatos, CA · 95032-1136

408-370-0138

Han-Wei Chen

Reg. 75350

Patent attorney

Campbell, CA · 95011

626-374-5305

Hana Oh Chen

Reg. 66656

Patent attorney

Quinn Emanuel Urquhart & Sullivan, LLP

Los Angeles, CA · 90017

213-443-3720

Jian Chen

Reg. 55053

Patent agent

Union City, CA · 94587

510-324-8888

Jing Chen

Reg. 82633

Patent agent

Greenberg Traurig, LLP

San Diego, CA · 92130

765-421-2507

John Youngfu Chen

Reg. 29782

Patent agent

HIiisborough, CA · 94010-7200

650-558-0333

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.