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 Van Pelt, Yi & James LLP, Knobbe Martens Olson & Bear LLP, and Gilead Sciences.

Top cities in California

All practitioners in California

Robyn E Wagner

Reg. 50575

Patent attorney

Van Pelt, Yi & James LLP

Cupertino, CA · 95014

408-973-2596

Bryan W Wahl

Reg. 58878

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Jennifer Lynn Wahlsten

Reg. 46226

Patent attorney

Gilead Sciences

Foster City, CA · 94404-1147

650-372-4447

Rebecca J Wais

Reg. 52333

Patent attorney

ExoPolymer Inc.

Mountain View, CA · 94303

650-303-8101

David C Wakefield

Reg. 43974

Patent attorney

Pinnock and Wakefield

San Diego, CA · 92103

619-858-3671

Abdul H. Wakil

Reg. 73208

Patent attorney

Lewis Roca Rothgerber Christie, LLP

Glendale, CA · 91209

626-795-9900

Jeannette Walder

Reg. 30698

Patent attorney

Yucca Valley, CA · 92286

714-565-1700

Clark A Waldon

Reg. 73504

Patent attorney

Holland Law LLP

San Francisco, CA · 94117

415-200-4980

Robert S Wales

Reg. 39413

Patent attorney

Winston & Strawn LLP

San Francisco, CA · 94111

415-425-7314

Blair D. Walker

Reg. 71570

Patent agent

Blair Walker IP Services, LLC

Mission Viejo, CA · 92691

949-584-7507

Darryl G Walker

Reg. 43232

Patent attorney

San Jose, CA · 95135

408-888-4409

Kent M Walker

Reg. 38649

Patent agent

Lewis kohn & Fitzwilliam LLP

San Diego, CA · 92130

858-436-1333

Letitia A. Walker

Reg. 68726

Patent attorney

Amgen

Thousand Oaks, CA · 91320-1799

805-313-3679

Michelle Y Walker

Reg. 53903

Patent agent

Galt, CA · 95632

808-927-9053

Ryan M Walker

Reg. 61027

Patent agent

Lafayette, CA · 94549

415-794-5219

Steven L Walker

Reg. 48020

Patent attorney

O2Micro, Inc.

Santa Clara, CA · 95054

408-987-5920

Timothy P Walker

Reg. 41521

Patent attorney

K&L Gates, LLP

San Francisco, CA · 94111

415-882-8200

Darien K Wallace

Reg. 53736

Patent attorney

Imperium Patent Works LLP

Pleasanton, CA · 94566

925-550-5067

David A. Wallace

Reg. 72155

Patent attorney

Johnson & Johnson

Fremont, CA · 94555

510-248-2363

David M Wallace

Reg. 64957

Patent agent

San Diego, CA · 92121

858-638-1866

Gregory J Wallace

Reg. 55793

Patent attorney

OpenTV Corp.

San Francisco, CA · 94111

415-962-5000

John V Wallace

Reg. 80557

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

650-433-5552

Robert M Wallace

Reg. 29119

Patent attorney

Law Office of Robert M. Wallace

Ventura, CA · 93003

805-644-4035

Thomas Lester Wallace

Reg. 34748

Patent attorney

Imperium Patent Works

Sunol, CA · 94586

925-862-9972

Brenda J Wallach

Reg. 45193

Patent agent

Sapphire Energy, Inc.

San Diego, CA · 92121

858-768-4700

John W Wallen· III

Reg. 35403

Patent attorney

Consultant

San Diego, CA · 92130

858-210-5935

David B Waller

Reg. 43978

Patent agent

Patent Success Strategies, LLC

Carlsbad, CA · 92008

858-768-1864

Brian J Walsh

Reg. 45543

Patent attorney

Attovia Therapeutics, Inc.

San Carlos, CA · 94070

510-399-5001

Cecilia A Walsh

Reg. 45659

Patent attorney

Los Altos, CA · 94024

650-390-0219

Chad R Walsh

Reg. 43235

Patent attorney

Fountainhead Law Group PC

Santa Clara, CA · 95050

408-244-6319

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.