US Plant Patent PP16223

Shamrock

Hydrangea plant named ‘Shamrock’

PUBLIC DOMAIN

Patent expired January 28, 2025. This plant is in the public domain — anyone may propagate and sell it.

Twenty years from the filing date would end on October 19, 2024. This patent earned 101 days of term adjustment for delay at the Patent Office, which is why it runs longer.

Figure 1 of US plant patent PP16223, the photograph of Shamrock printed in the patent. — Figure 1 from US Plant Patent PP16223, reproduced as printed. Photographs in a plant patent are taken by the applicant. Reproduction of the patent document is permitted; the image is shown whole and uncropped for that reason.

The record

Patent number: PP16223
Filed: October 19, 2004
Granted: January 31, 2006
Expires: January 28, 2025
Assignee: SPRING MEADOW NURSERY INC
Inventor: MALLET CORINNE

Abstract

A new and distinct cultivar of Hydrangea plant named ‘Shamrock’, characterized by its upright and outwardly spreading plant habit; lacecap-type inflorescences; double-type sterile flowers; and pink-colored flowers that become closer to dark red in color with development.

Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.

1. A new and distinct cultivar of Hydrangea plant named ‘Shamrock’, as illustrated and described.

Read the full patent: US Plant Patent PP16223 in full — the complete specification, every figure, and the file history.