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 Martine Penilla & Gencarella, LLP, Nokia, Inc., and Intuitive Surgical.

Top cities in California

All practitioners in California

Karen Cheng

Reg. 80196

Patent agent

San Diego, CA · 92104

510-295-9241

Lie-Yea Cheng

Reg. 52732

Patent agent

Martine Penilla & Gencarella, LLP

Sunnyvale, CA · 94085

408-774-6924

Melinda J. Cheng

Reg. 84444

Patent agent

Chino, CA · 91708

909-364-1361

Shih Yo Cheng

Reg. 60698

Patent attorney

South San Francisco, CA · 94080

650-793-8597

Victoria Cheng

Reg. 79641

Patent attorney

San Diego, CA · 92126

832-605-2488

Wen-Kuo Cheng

Reg. 60067

Patent agent

Nokia, Inc.

San Diego, CA · 92130

858-831-4953

Wendy H. Cheng

Reg. 51555

Patent attorney

Intuitive Surgical

Sunnyvale, CA · 94086

408-523-2100

William C Cheng

Reg. 64473

Patent agent

Dickinson Wright RLLP

Sunnyvale, CA · 94086

408-701-6146

Xue Ming Jimmy Cheng

Reg. 56045

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121

858-658-2271

Yeu-Ting G Cheng

Reg. 69408

Patent agent

Van Pelt, Yi & James LLP

Cupertino, CA · 95014

408-207-4765

Seyoung Cheon

Reg. 75862

Patent attorney

Perkins Coie, LLP

San Diego, CA · 92130-2594

858-720-5751

Che Swyden Chereskin

Reg. 41466

Patent agent

Knobble Martens Olson and Bear, LLP

Irvine, CA · 92614

949-721-6385

Joseph A Chern

Reg. 63246

Patent attorney

Orrick, Herrington & Sutcliffe LLP

Irvine, CA · 92614-8255

949-567-6700

Margaret Chern

Reg. 68755

Patent agent

San Diego, CA · 92138-2683

858-414-9254

Jing H Cherng

Reg. 68144

Patent attorney

Spencer Fane LLP

San Jose, CA · 95113

408-286-5100

Vera M Chernobylsky

Reg. 58433

Patent attorney

Law Offices of Vera Chernobylsky

Woodland Hills, CA · 91364

818-251-6783

Jay A Chesavage

Reg. 39137

Patent agent

File-EE-Patents.Com

Palo Alto, CA · 94303

650-619-5270

Charles W Chesney

Reg. 45874

Patent attorney

Qualcomm Inc.

San Diego, CA · 92121-1714

858-651-9711

Rosa F Cheuk Kim

Reg. 68607

Patent agent

Cibus US, LLC

San Diego, CA · 92121

858-450-0008 X137

Cheuk Hang Kevin Cheung

Reg. 76947

Patent agent

Glendora, CA · 91741

626-695-8386

Concord Cheung

Reg. 82340

Patent attorney

JONES DAY

Palo Alto, CA · 94303

650-739-3939

Herman Yuk Shing Cheung

Reg. 56517

Patent attorney

Sunnyvale, CA · 94085

415-425-3063

Katherine C Cheung

Reg. 70525

Patent attorney

DLA Piper

East Palo Alto, CA · 94303

650-833-2161

Rhys Wing-Gee Cheung

Reg. 58648

Patent attorney

c/o Nasa Ames Research Center

Moffett Field, CA · 94035

650-604-6928

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

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.