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 Wilson Sonsini Goodrich & Rosati, Verizon Communications, and The Law Office Of Jack Fitzgerald, PC.

Top cities in California

All practitioners in California

James Michael Pershon

Reg. 33990

Patent agent

Verizon Communications

San Jose, CA · 95136

408-224-3823

Melanie R Persinger

Reg. 63111

Patent agent

The Law Office Of Jack Fitzgerald, PC

San Diego, CA · 92103

619-692-3840

Richard Vaughn Person

Reg. 42991

Patent attorney

Amgen, Inc

Thousand Oaks, CA · 91320

805-447-3299

Laura M. Personick

Reg. 59658

Patent attorney

Palantir Technologies, Inc

Palo Alto, CA · 94301

650-815-0821

Hemavathy Perumal

Reg. 76941

Patent attorney

ArentFox Schiff LLP

Los Angeles, CA · 90071

213-629-7400

Yury A Perzov

Reg. 58547

Patent agent

San Jose, CA · 95110

217-766-1700

Boris M. Pesin

Reg. 74541

Patent attorney

Stripe Inc

South San Francisco, CA · 94080

301-461-9935

Maysam Mohammadi Pessian

Reg. 77926

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2300

Millad M. Pessian

Reg. 84725

Patent agent

Mission Viejo, CA · 92692

949-903-4473

Karol Michele Pessin

Reg. 34899

Patent attorney

Alameda, CA · 91362

412-501-0571

Ayako W Peters

Reg. 77483

Patent attorney

Irvine, CA · 92612

949-939-8455

Howard McDowell Peters

Reg. 29202

Patent attorney

Peters Verny, LL.P

Palo Alto, CA · 94306

650-326-1677

Loretta A Peters

Reg. 43855

Patent attorney

SanDisk Corporation,

Milpitas, CA · 95035-7932

408-801-2147

Marc David Peters

Reg. 46988

Patent attorney

Thompson Hine LLP

San Mateo, CA · 94402-3158

650-521-5935

Michael G Peters

Reg. 42993

Patent agent

Santa Clara, CA · 95051

408-246-7859

Richard R Peters

Reg. 61441

Patent attorney

Mill Valley, CA · 94941

949-259-3627

Benjamin A. Petersen

Reg. 67456

Patent attorney

Oakland, CA · 94608

310-804-7511

Jonathan F. Petersen

Reg. 70446

Patent agent

Santa Clara, CA · 95050

650-421-3908

Lara A Petersen

Reg. 76986

Patent attorney

Omni Legal Group

Los Angeles, CA · 90024

310-276-6664

Russell C Petersen

Reg. 53457

Patent attorney

Security People, Inc. DBA Digilock

Petaluma, CA · 94954

707-242-8348

Steven Cannon Petersen

Reg. 36238

Patent attorney

Newlight Technologies,LLC

Irvine, CA · 92614

888-269-0489

Douglas Robert Peterson

Reg. 53458

Patent attorney

Steptoe & Johnson LLP

Los Angeles, CA · 90071

213-439-9417

Eric W. Peterson

Reg. 64312

Patent attorney

The Law Office of Eric W. Peterson

San Diego, CA · 92101

858-688-9773

Isaac S Peterson

Reg. 66935

Patent attorney

Netflix, Inc.

Los Gatos, CA · 95032

408-540-3700

John Edward Peterson

Reg. 45894

Patent attorney

Sequenom

San Diego, CA · 92121

858-202-9397

Mark A. Peterson

Reg. 75919

Patent attorney

Penumbra Inc.

Alameda, CA · 94502

188-827-24606

Rebecca G Peterson

Reg. 39751

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

Walnut Creek, CA · 94596

925-472-5000

Richard Esty Peterson

Reg. 26495

Patent attorney

Richard Esty Peterson, Patent Attorney

San Francisco, CA · 94131

415-826-3921

Robert Kenneth Peterson

Reg. 36892

Patent attorney

Thousand Oaks, CA · 91359

818-597-0817

Teresa E. Peterson

Reg. 75250

Patent agent

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304-1050

650-849-3213

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.