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 Dexcom, Goodwin Procter, LLP, and Wiersch IP Law.

Top cities in California

All practitioners in California

Mark D Wieczorek

Reg. 37966

Patent attorney

Dexcom

San Diego, CA · 92121

619-818-4615

Mayim E. Wiens

Reg. 76056

Patent agent

Goodwin Procter, LLP

San Francisco, CA · 94111

415-733-6233

Michael Patrick Wiersch

Reg. 55996

Patent attorney

Wiersch IP Law

Loomis, CA · 95650

650-665-3710

Leland Z Wiesner

Reg. 39424

Patent attorney

Wiesner & Associates

Palo Alto, CA · 94301

650-853-1113 X101

Richard M Wiesner

Reg. 48748

Patent attorney

Sacramento, CA · 95814

916-498-1010

J William Wigert· Jr

Reg. 24582

Patent attorney

Bay Area Technology Law Group

Emeryville, CA · 94608

415-868-4072

Sherron L. Wiggins

Reg. 80037

Patent attorney

Conkle, Kremer & Engel

Santa Monica, CA · 90403

310-998-9100

Donald T Wight

Reg. 53771

Patent attorney

Murrieta, CA · 92562

951-303-2020

Todd W Wight

Reg. 45218

Patent attorney

Rutan & Tucker, LLP.

Costa Mesa, CA · 92626

714-641-5100

Diane Wilcock

Reg. 65991

Patent attorney

XOMA (US) LLC

Berkeley, CA · 94710

510-204-7273

David E Wildman

Reg. 40226

Patent attorney

San Mateo, CA · 94401

973-220-4041

Jeffrey C Wilk

Reg. 42227

Patent attorney

Apogee Law Group P.C.

Irvine, CA · 92618

949-862-8479

Kathryn P Wilke

Reg. 37472

Patent attorney

Martinez, CA · 94553

925-608-3364

Magdalena H Wilkinson

Reg. 54473

Patent attorney

Mountain View, CA · 94040

650-964-9489

Yi S Wilkinson

Reg. 62306

Patent attorney

Mountain View, CA · 94040

650-386-6865

Bryan J. Willard

Reg. 77426

Patent agent

Los Angeles, CA · 90034

440-321-0440

Taryn T. Willett

Reg. 80379

Patent agent

Perkins Coie

Palo Alto, CA · 94304

650-838-4570

Deirdre M Willgohs

Reg. 81790

Patent agent

Mintz Levin

San Diego, CA · 92130

858-314-1500

Ralph H Willgohs

Reg. 48800

Patent agent

Los Gatos, CA · 95032

408-358-0489

Brian K Williams

Reg. 52363

Patent agent

Ramona, CA · 92065

760-788-8744

Cleveland R Williams· III

Reg. 27080

Patent attorney

Fullerton, CA · 92831

714-269-3651

Dwight M Williams

Reg. 82842

Patent agent

Los Angeles, CA · 90057

310-630-9522

Elliott T Williams

Reg. 82841

Patent agent

Fremont, CA · 94538

417-844-6556

Gail A Williams

Reg. 71988

Patent attorney

Mountain View, CA · 94043

203-687-8175

Gary S Williams

Reg. 31066

Patent attorney

Morgan, Lewis & Bockius LLP

Palo ALto, CA · 94304

650-843-4000

Larry M Williams

Reg. 39428

Patent agent

Williams Intellectual Property Services

Oxnard, CA · 93035

707-327-2475

Martin K Williams

Reg. 72292

Patent attorney

Folsom, CA · 95630

916-416-647

Nicole L Williams

Reg. 60739

Patent agent

2S Ventures, LLC

Pasadena, CA · 91103

323-919-2704

Stefan S. Williams

Reg. 67037

Patent attorney

Advanced Sterilization Products, Inc.

Irvine, CA · 92618

714-905-9931

Thomas G Williams

Reg. 68925

Patent agent

Los Altos, CA · 94024

650--64-4-5596

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.