US Plant Patent PP18501

Ryusen

Acer palmatum plant named ‘Ryusen’

UNDER PATENT

Still under patent. Protection ends September 26, 2026.

Twenty years from the filing date would end on September 12, 2026. This patent earned 14 days of term adjustment for delay at the Patent Office, which is why it runs longer.

Figure 1 of US plant patent PP18501, the photograph of Ryusen printed in the patent. — Figure 1 from US Plant Patent PP18501, 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: PP18501
Filed: September 12, 2006
Granted: February 19, 2008
Expires: September 26, 2026
Assignee: ITSAUL PLANTS LLC
Inventor: KOBAYASHI KAZUHARA

Abstract

A new cultivar of Acer palmatum, ‘Ryusen’, characterized by a an unique true weeping plant habit, its rich fall color of red and gold coloration, and its ability to be readily grafted on Acer palmatum rootstock.

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 Acer palmatum plant named ‘Ryusen’ as herein illustrated and described.

Read the full patent: US Plant Patent PP18501 in full — the complete specification, every figure, and the file history.