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 Fulwider Patton Lee and Utecht LLP, Knobbe, Martens, Olson & Bear, LLP., and Abbott Laboratories.

Top cities in California

All practitioners in California

David J Pitman

Reg. 48777

Patent attorney

Fulwider Patton Lee and Utecht LLP

Los Angeles, CA · 90045

310-824-5555

Carol M Pitzel Cruz

Reg. 61224

Patent attorney

Knobbe, Martens, Olson & Bear, LLP.

Irvine, CA · 92614

949-760-0404

Robin M Plachy

Reg. 74086

Patent attorney

Abbott Laboratories

Sylmar, CA · 91354

224-668-5239

Matthew J Placide

Reg. 81470

Patent agent

Sherpa Technology Group

San Francisco, CA · 94109

214-707-3930

Mark H Plager

Reg. 35648

Patent attorney

Plager Schack LLP

Huntington Beach, CA · 92647

714-698-0601

William Carroll Plants

Reg. 43002

Patent agent

Campbell, CA · 95008

408-761-0651

Sean Christian Platt

Reg. 46998

Patent attorney

Jones Day

San Diego, CA · 92121

858-314-1200

Irene T Pleasure

Reg. 45506

Patent attorney

Arsenal Bio

South San Francisco, CA · 94080

650-240-8844

David A Plettner

Reg. 36241

Patent attorney

Cupertino, CA · 95014-3362

408-973-9256

Lorrel Ami Plimier

Reg. 46555

Patent attorney

Piedmont, CA · 94610

510-295-7027

Michael Delmas Plimier

Reg. 43004

Patent attorney

Intel Corporation

Santa Clara, CA · 95054

408-765-7857

Caitlin C. Ploch

Reg. 77615

Patent agent

Schox Patent Group

San Francisco, CA · 94107

313-969-3682

David Michael Plouff

Reg. 48263

Patent attorney

Morris Polich & Purdy LLP

San Diego, CA · 92101

619-557-04040

Alec B Plumb

Reg. 56433

Patent attorney

Law Offices of Alec B. Plumb

Fresno, CA · 93755-5574

559-478-2060

David A Plumley

Reg. 37208

Patent attorney

LEWIS ROCA ROTHGERBER CHRISTIE LLP

Glendale, CA · 91209-9001

626-795-9900

Daniel M. Podgorski

Reg. 79025

Patent agent

Crinetics Pharmaceuticals

San Diego, CA · 92121

858-450-6464

Perry P Poff

Reg. 73423

Patent attorney

Donnell, Melgoza & Scates LLP

Rocklin, CA · 95677

916-624-4551

Jill A Poimboeuf

Reg. 62086

Patent attorney

Davis, CA · 95616

270-210-8793

Joshua N Poimboeuf

Reg. 63774

Patent agent

Davis, CA · 95616

270-210-5953

Charles Philip Poirier

Reg. 43006

Patent attorney

Davis Wright Tremaine LLP

San Francisco, CA · 94111

415-276-6500

Victoria A Poissant

Reg. 56871

Patent agent

HI LLC

Venice, CA · 90291

323-805-7699

Scott A Pojunas

Reg. 62590

Patent attorney

Merlyn Mind, Inc.

Mountain View, CA · 10018

657-331-5801

Renee S Polizotto

Reg. 53474

Patent agent

thermo Fisher Scientific

South San Francisco, CA · 94080

650-266-5807

Catherine Mary Polizzi

Reg. 40130

Patent attorney

Morrison and Foerster, LLP

Palo Alto, CA · 94304

650-813-5651

Michael M Polka

Reg. 75084

Patent attorney

Reichman Jorgensen Lehman & Feldberg LLP

Redwood City, CA · 94065

650-623-1416

Howard G. Pollack

Reg. 81852

Patent attorney

Power Integrations, Inc.

San Jose, CA · 95138

408-414-9630

Vincent M Pollmeier

Reg. 52129

Patent attorney

Karish & Bjorgum

Pasadena, CA · 91103

626-864-8820

David T Pollock

Reg. 48977

Patent attorney

Reed Smith LLP

San Francisco, CA · 94105-3659

415-659-5620

Michael John Pollock

Reg. 29098

Patent attorney

Dergosits & Noah LLP

San Francisco, CA · 94111

415-705-6377

John Michael Polo

Reg. 48738

Patent agent

Danville, CA · 94506

510-277-2915

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.