QPSTB

QPSTB

Willow oak tree named ‘QPSTB’

PUBLIC DOMAIN

Patent expired June 3, 2024. This plant is in the public domain — anyone may propagate and sell it.

Twenty years from the filing date would end on December 15, 2025, but this patent ends 560 days earlier — a terminal disclaimer gives term back. A source that calculates twenty years from filing would tell you this plant is still protected when it is already free.

Figure 1 of US plant patent PP18321, the photograph of QPSTB printed in the patent.

Figure 1 from US Plant Patent PP18321, 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.

Abstract

A Willow Oak tree named ‘QPSTB’ having a dense canopy, dominant central leader, unique red fall color, and relatively fast growth rate, and also capable of being reproduced reliably using softwood cutting methods.

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

1. A new and distinct variety of Willow Oak tree named ‘QPSTB,’ substantially as herein illustrated and described, characterized particularly as to novelty by its dense canopy, dominant central leader, unique red fall color, and relatively fast growth rate.

Read the full patent: US Plant Patent PP18321 in full — the complete specification, every figure, and the file history.

The record

Abstract