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 Denali Therapeutics Inc., Rutan & Tucker, LLP, and Patterson + Sheridan, LLP.

Top cities in California

All practitioners in California

Christopher J. Walsh

Reg. 55709

Patent attorney

Denali Therapeutics Inc.

South San Francisco, CA · 94080-4990

650-866-8555

Kathleen M Walsh

Reg. 64809

Patent attorney

Mountain View, CA · 94041

Michael C. Walsh

Reg. 78672

Patent agent

Rutan & Tucker, LLP

Irvine, CA · 92612

714-641-5100

Mitchell G. Walsh

Reg. 79102

Patent agent

Patterson + Sheridan, LLP

Aliso Viejo, CA · 92656

925-951-8009

Shawn T. Walsh

Reg. 70154

Patent agent

Microelectronic Devices IP LLC

El Cerrito, CA · 94530

214-766-8858

Derek C. Walter

Reg. 74656

Patent attorney

Weil Gotshal & Manges

Redwood Shores, CA · 94065

650-802-3934

Steven C. Walter

Reg. 82792

Patent attorney

Orange, CA · 92868

650-823-3695

Eric S Walters

Reg. 45422

Patent attorney

Walters Wilson LLP

Redwood City, CA · 94063

650-817-5625

James R Walters

Reg. 61523

Patent attorney

Lorenz & Kopf, LLP

San Diego, CA · 92130

858-461-7035

Ralph Eugene Walters

Reg. 22070

Patent attorney

Vista, CA · 92084

760-941-1454

Elysa Q. Wan

Reg. 71326

Patent attorney

O'Melveny & Myers LLP

San Francisco, CA · 94111

415-984-8817

Hao Jan Wan

Reg. 65231

Patent agent

Cupertino, CA · 95014

510-565-4074

Jessica M. Wan

Reg. 79436

Patent attorney

Ferguson Case Orr Paterson, LLP

Ventura, CA · 93004

805-659-6800

Jing Wan

Reg. 71194

Patent agent

Glendale, CA · 91205

917-434-3395

Joy Y Wan

Reg. 75374

Patent agent

Stanford University School of Medicine

Stanford, CA · 94305-5324

408-314-5498

Tiffany Wan

Reg. 75544

Patent attorney

Hickman Palermo Becker Bingham

San Jose, CA · 95113

408-414-1213

Tim W Wan

Reg. 45421

Patent attorney

Capitola, CA · 95010

831-400-9483

Yaqi Wan

Reg. 69456

Patent agent

San Francisco, CA · 94133

310-283-9680

Grant P. Wanderscheid

Reg. 81226

Patent attorney

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-324-6367

Allen W Wang

Reg. 68456

Patent attorney

Fenwick & West

Mountain View, CA · 94041

650-335-7288

Andy Z. Wang

Reg. 83790

Patent agent

San Jose, CA · 95129

669-269-3279

Anne Wang

Reg. 36045

Patent attorney

Frost Brown Todd LLP

Los Angeles, CA · 90071

213-229-2400

Bin Wang

Reg. 64921

Patent attorney

Cooley Godward Kronish LLP

Palo Alto, CA · 94306

650-843-5032

Brian Dingting Wang

Reg. 77454

Patent attorney

California Attorney General's Office

San Francisco, CA · 94102

415-510-3487

Chao Wang

Reg. 80687

Patent agent

JONES DAY

San Diego, CA · 92122

858-314-1171

Chia-Jean Wang

Reg. 65988

Patent agent

Palo Alto, CA · 94301

310-709-5146

Christine E Wang

Reg. 67371

Patent attorney

San Jose, CA · 95128

408-507-4220

Chuantong Wang

Reg. 70324

Patent attorney

Baker Botts

Palo Alto, CA · 94304

650-739-7576

Chun Ming Wang

Reg. 60778

Patent agent

Fremont, CA · 94539

510-825-0756

David L. Wang

Reg. 57405

Patent attorney

Palo Alto, CA · 94304-1050

408-867-3985

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.