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 Genentech, Inc., Kafantaris Law Offices, and Cognition IP.

Top cities in California

All practitioners in California

Theologos G Kafantaris

Reg. 64853

Patent attorney

Kafantaris Law Offices

Irvine, CA · 92618

614-214-8616

Mark D. Kafka

Reg. 59569

Patent agent

Genentech, Inc.

South San Francisco, CA · 94080

650-467-8688

Linda J. Kahl

Reg. 68999

Patent attorney

Walnut Creek, CA · 94595

925-283-1751

Saleh Kaihani

Reg. 74475

Patent attorney

Cognition IP

San Francisco, CA · 94105

650-772-5660

Samuel M Kais

Reg. 42705

Patent attorney

Medivation, Inc.

San Francisco, CA · 94105

415-549-5205

Anne Marie Kaiser

Reg. 37649

Patent attorney

Edwards Lifesciences

Irvine, CA · 92614

949-250-2574

John J. Kaiser

Reg. 77869

Patent agent

Kaiser Legal Services, Inc.

San Diego, CA · 92163

619-634-9910

Joshua D. Kaiser

Reg. 78347

Patent agent

Escondido, CA · 92027

818-357-8725

Lisa T Kajisa

Reg. 57516

Patent agent

Affymetrix, Inc.

Santa Clara, CA · 95051

408-731-5000

Kelvin K. Kakugawa

Reg. 61620

Patent agent

San Francisco, CA · 94123

415-305-3005

Brianne E.O. Kalach

Reg. 84067

Patent attorney

Bartko Pavia

San Francisco, CA · 94111

415-291-4514

Reza Kalbasi

Reg. 76121

Patent agent

San Diego, CA · 92130

214-718-0546

Ingrid Kaldre

Reg. 66109

Patent attorney

Redwood City, CA · 94063

704-989-0550

Rohan T Kale

Reg. 69129

Patent attorney

Elasticsearch, Inc.

Mountain View, CA · 94040

404-954-2743

Tamara A. Kale

Reg. 53087

Patent attorney

c/o Revolution Medicines, Inc.

Redwood City, CA · 94063

650-779-2245

Stuart Philip Kaler

Reg. 35913

Patent attorney

CTM Patent Strategies

San Francisco, CA · 94123

415-902-8012

Damon K I Kali

Reg. 50541

Patent attorney

Kali Law Group, P.C.

Sunnyvale, CA · 94088-0187

408-420-2381

Grant E Kalinowski

Reg. 48314

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080-4990

650-467-2607

Francis T Kalinski

Reg. 44177

Patent attorney

Kalinski & Associates, LLP

Monterey, CA · 93942

619-300-7070

Sue S Kalman

Reg. 54727

Patent agent

PhyNexus, Inc.

San Jose, CA · 95136

408-267-7214

David Steven Kalmbaugh

Reg. 29234

Patent attorney

Oxnard, CA · 93036-7781

805-485-5040

Sivon Kalminov

Reg. 40042

Patent attorney

Canon

Irvine, CA · 92612

949-932-3329

Pavel Kalousek

Reg. 44178

Patent agent

Palomar Mountain, CA · 92060-0245

858-754-9154

Sunil D Kalra

Reg. 43702

Patent agent

Los Angeles, CA · 90017

213-355-7000

Seth Z Kalson

Reg. 40670

Patent attorney

Fullerton, CA · 92831

831-247-7766

Chitra M Kalyanaraman

Reg. 68585

Patent attorney

Maynard Cooper & Gale

San Francisco, CA · 9410894111

415-646-4681

Ali Kamarei

Reg. 37000

Patent attorney

Inhouse Company

San Jose, CA · 95113

408-918-5393

Michael A. Kamboures

Reg. 63033

Patent agent

Lake Forest, CA · 92630

949-735-3893

Rena Kaminsky

Reg. 46818

Patent attorney

Cooley Godward Kronish, LLP

Palo Alto, CA · 94306-2155

650-843-7400

Daniel A Kamkar

Reg. 71679

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

858-707-4180

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.