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 Knobbe Martens Olson & Bear, LLP, Alston & Bird LLP, and TSMC.

Top cities in California

All practitioners in California

Emily Y Shu

Reg. 62014

Patent agent

Alston & Bird LLP

East Palo Alto, CA · 94303

650-838-2028

Jen Shu

Reg. 74572

Patent agent

TSMC

Saratoga, CA · 95070

408-439-2986

Harnik Shukla

Reg. 73097

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Nima D. Shull

Reg. 76836

Patent agent

San Diego, CA · 92116

949-945-4071

Ida C Shum

Reg. 50780

Patent attorney

Hacienda Heights, CA · 91745

562-698-3064

Barry M Shuman

Reg. 50220

Patent agent

Woodland Hills, CA · 91367

805-794-1840

Kenneth R Shurtz

Reg. 66184

Patent attorney

Kilpatrick Townsend and Stockton LLP

Menlo Park, CA · 94025

650-326-2400

Michael J Shuster

Reg. 41310

Patent attorney

Fenwick & West, LLP

Mountain View, CA · 94041

415-875-2413

Alexander Shvarts

Reg. 47943

Patent attorney

Shvarts & Leiz LLP

Palo Alto, CA · 94303

650-681-0772

Daniel T Shvodian

Reg. 42148

Patent attorney

PERKINS COIE LLP

Palo Alto, CA · 94304-1212

650-838-4413

Andrew Walter Shyjan

Reg. 61294

Patent attorney

Amyris, Inc.

Emeryville, CA · 94608

510-597-4777

Margaret H Shyr

Reg. 63475

Patent attorney

Quinn Emanuel Urquhart & Sullivan LLP

Redwood Shores, CA · 94065

650-483-8431

William P Sibert

Reg. 43120

Patent agent

Clorox

Pleasanton, CA · 94588

925-425-6396

Kenneth Douglas Sibley

Reg. 31665

Patent attorney

Carbon, Inc.

Redwood City, CA · 94063

650-285-6307

Lorenz Siddiqi

Reg. 59404

Patent attorney

Allergan, Inc.

Irvine, CA · 92612

714-246-3425

Brian W Siddons

Reg. 62776

Patent agent

BASF Enzymes LLC

San Diego, CA · 92191-0550

858-431-8588

J. Suzanne Siebert

Reg. 28758

Patent attorney

Symbolic Solutions

Berkeley, CA · 94703

510-843-2425

Sarah A. Siedlak

Reg. 76124

Patent attorney

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2387

Charles D. Siegal

Reg. 62300

Patent attorney

Munger Tolles & Olson LLP

Los Angeles, CA · 90071-1560

213-683-9181

Daniel R Siegel

Reg. 38751

Patent attorney

Dewin and Siegel LLP

Portola Valley, CA · 94028

650-465-1065

Ira Mark Siegel

Reg. 28907

Patent attorney

Ira M. Siegel, Law Offices Ira M. Siegel

Beverly Hills, CA · 90210

310-435-7656

Jaime A Siegel

Reg. 39027

Patent attorney

Jamie Siegel, Esq.

RANCHO MIRAGE, CA · 92270

201-615-0584

Nathan S. Siegel

Reg. 82856

Patent agent

San Diego, CA · 92129

858-863-3039

Miriam L Siekevitz

Reg. 40173

Patent agent

PDL Bio Pharma, INc.

Redwood City, CA · 94063

650-454-2609

Scott G. Siera

Reg. 68522

Patent attorney

Knobbe Martens Olson & Bear, LLP

San Francisco, CA · 94104

415-954-4114

Christopher M Siino

Reg. 78085

Patent agent

Irvine, CA · 92619

949-355-1894

Edward H Sikorski

Reg. 39478

Patent attorney

DLA Piper, LLP US

San Diego, CA · 92121

619-699-2645

Gil G Silberman

Reg. 43122

Patent attorney

Genesis, LLP

San Francisco, CA · 94110

415-285-7400

Gregory P Silberman

Reg. 39836

Patent attorney

Jones Day

Palo Alto, CA · 94303

650-739-3954

Robin M Silva

Reg. 38304

Patent attorney

Xencor

Monrovia, CA · 91016

415-722-5031

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.