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 Willkie Farr & Gallagher LLP, DJI TECHNOLOGY, INC., and Hulu.

Top cities in California

All practitioners in California

Wendy W Cheung

Reg. 75407

Patent attorney

Willkie Farr & Gallagher LLP

Palo Alto, CA · 94304

650-887-9300

Yin Cheung

Reg. 70386

Patent attorney

DJI TECHNOLOGY, INC.

BURBANK, CA · 91502

818-975-2000

Win Chevapravatdumrong

Reg. 58889

Patent agent

Hulu

Santa Monica, CA · 90404

310-571-4994

Brian T Chew

Reg. 74825

Patent agent

Pasadena, CA · 91106

415-857-3685

Rohit Chhabra

Reg. 70342

Patent attorney

Chhabra Law Firm, PC

San Francisco, CA · 94111

650-564-7929

Clifford O. Chi

Reg. 62409

Patent attorney

Mission Viejo, CA · 92691

310-497-0181

Cynthia Ann Chi

Reg. 73916

Patent attorney

Los Angeles, CA · 90039

832-877-2825

Icheng S Chi

Reg. 55059

Patent agent

Genentech, INC.

South San Francisco, CA · 94080-4990

650-467-7044

Justin J Chi

Reg. 73615

Patent attorney

Arnold & Porter Kaye Scholer LLP

Los Angeles, CA · 90017

213-243-4030

Pei Chun Chi

Reg. 69801

Patent agent

Saratoga, CA · 95070

408-973-8859

Richard Chi

Reg. 56325

Patent attorney

Law Offices of Richard Chi

Temple City, CA · 91780

626-372-3976

Cecilia L Chi-Ham

Reg. 70615

Patent agent

Woodland, CA · 95695

530-668-0711

Thomas Hsin-Chi Chia

Reg. 63990

Patent attorney

Via Licensing

San Francisco, CA · 94103

415-645-5014

Campbell C Chiang

Reg. 56518

Patent attorney

Kubota & Basol

Los Angeles, CA · 90017

858-651-0627

Cheng Ju Chiang

Reg. 64282

Patent agent

Flash Intellectual Property, Inc.

Chino, CA · 91708

714-390-9373

Debbie H Chiang

Reg. 50888

Patent attorney

Shway, Inc.

Arcadia, CA · 91006

626-215-4645

Jennifer S Chiang

Reg. 68198

Patent attorney

Anthropic, PBC

San Francisco, CA · 94105

425-223-3951

Joanna L Chiang

Reg. 55060

Patent attorney

Arcadia, CA · 91006

626-294-9391

Mimi H Chiang

Reg. 46618

Patent attorney

Perkins Coie LLP

Los Angeles, CA · 90067-1721

310-788-9900

Robin Chen Chiang

Reg. 46619

Patent attorney

Lawrence Berkeley National Laboratory

Berkeley, CA · 94720

510-486-4534

Stephen Chiang

Reg. 48952

Patent attorney

Arcadia, CA · 91006

626-241-6138

Steve W. Chiang

Reg. 69766

Patent attorney

RPX Corporation

San Francisco, CA · 94111

415-852-3188

Terry T Chiang

Reg. 65524

Patent attorney

Foster City, CA · 94404

408-518-5530

Colleen V Chien

Reg. 55062

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

415-875-2319

Peter W Chien

Reg. 44076

Patent attorney

Pasadena, CA · 91106

626-795-6935

Elizabeth Chien-Hale

Reg. 44077

Patent attorney

San Jose, CA · 95112

408-776-8719

Winthrop D Childers

Reg. 40952

Patent agent

WDC Patents

San Diego, CA · 92127

858-254-8210

Alison L Chin

Reg. 70002

Patent agent

San Francisco, CA · 94132

415-566-2756

Chung Kuang Chin

Reg. 73323

Patent agent

Saratoga, CA · 95070

408-366-2398

Gordon Y. Chin

Reg. 73324

Patent agent

Cupertino, CA · 95014

408-772-9958

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.