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 Koppel, Patrick, Heybl & Philpott, Loza & Loza, LLP, and Umberg Zipser LLP.

Top cities in California

All practitioners in California

Brian J. Philpott

Reg. 58688

Patent attorney

Koppel, Patrick, Heybl & Philpott

Westlake Village, CA · 91361

805-373-0060

Michael J. Phipps

Reg. 69382

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

214-929-2073

Andy T Pho

Reg. 48862

Patent attorney

HUNTINGTON BEACH, CA · 92648

408-771-9999

Priti D Phukan

Reg. 70109

Patent agent

Umberg Zipser LLP

Irving, CA · 92614

949-679-0052

Kien D Phung

Reg. 74834

Patent agent

Kilpatrick Townsend & Stockton LLP

Menlo Park, CA · 94025

650-752-2457

Arash Pia

Reg. 82380

Patent attorney

Knobbe Martens

Irvine, CA · 92614

949-721-5276

Andrew Y Piatnicia

Reg. 40772

Patent attorney

San Jose, CA · 95129

408-217-9269

Gregory Alexander Piccionelli

Reg. 39534

Patent attorney

Gregory A. Piccionelli,

Westlake Village, CA · 91362

747-220-6820

Christopher M Pickett

Reg. 37531

Patent attorney

Pelican Imaging Inc.

Santa Clara, CA · 95050

408-241-3878

Andrew Wayne Pickholtz

Reg. 33991

Patent attorney

Cupertino, CA · 95014

415-206-0112

Jeremy Rae Pierce

Reg. 59034

Patent agent

Knobble, Martens, Olson & Bear LLP

San Diego, CA · 92130

858-707-4000

Edith A. Pierre-Jerome

Reg. 81729

Patent agent

Morrison Foerster

San Diego, CA · 92130

858-314-7651

Andrew M Pierz

Reg. 73853

Patent attorney

LiLaw Inc.

Los Altos, CA · 94022

800-836-1576

Christopher D. Pilling

Reg. 66771

Patent agent

Pilling Intellectual Property, LLC

Healdsburg, CA · 95448

707-473-8295

Rosemarie Pilpa

Reg. 78357

Patent agent

Allergan

Irvine, CA · 92612

714-246-2591

Pablo G. Pinasco

Reg. 71272

Patent attorney

Corona, CA · 92881

951-965-5292

Edward J. A. Pineda

Reg. 62384

Patent attorney

San Jose, CA · 95131

408-942-1052

Lukas J Pinkston

Reg. 79154

Patent agent

Atherton, CA · 94027

650-704-7949

Faith J. Pinney

Reg. 83745

Patent agent

Palo Alto, CA · 94306

509-844-3212

Douglas A Pinnow

Reg. 70814

Patent agent

Lake Elsinore, CA · 92532

951-674-2598

Robert Herman Pinsker

Reg. 42078

Patent attorney

Pacific Physicians Medical, Inc.

Palo Alto, CA · 94301-3102

650-335-3200

James Charles Pintner

Reg. 33272

Patent attorney

Campbell, CA · 95008

408-679-1391

James T. Pinyerd

Reg. 58689

Patent attorney

SRI International

Menlo Park, CA · 94025

812-219-0321

Sung J Pio

Reg. 63290

Patent agent

Chevron Corporation

Richmond, CA · 94802

510-242-2883

Nicola A Pisano

Reg. 34408

Patent attorney

Cozen O'Connor

San Diego, CA · 92101

619-685-1714

Jeanine M Pisoni

Reg. 37698

Patent attorney

AT&T Communications Company

El Segundo, CA · 90245

424-225-0413

Robert W. Piston

Reg. 72612

Patent agent

10x Genomics, Inc.

Pleasanton, CA · 94588-3260

925-401-7300

James Charles Pistorino

Reg. 44290

Patent attorney

Parrish Law Office

Menlo Park, CA · 94025

650-400-0043

Walter J. Piszker

Reg. 78682

Patent agent

Topanga, CA · 90290

310-993-9739

David P. Pitinga

Reg. 58690

Patent attorney

Martine Penilla & Gencarella, LLP

Sunnyvale, CA · 94085

408-774-6927

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.