US Plant Patent PP20428

Improved Chancellor

Grape plant named ‘Improved Chancellor’

PUBLIC DOMAIN

Patent expired April 22, 2026. This plant is in the public domain — anyone may propagate and sell it.

Twenty years from the filing date would end on August 17, 2025. This patent earned 248 days of term adjustment for delay at the Patent Office, which is why it runs longer.

Figure 1 of US plant patent PP20428, the photograph of Improved Chancellor printed in the patent. — Figure 1 from US Plant Patent PP20428, 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: PP20428
Filed: August 17, 2005
Granted: October 20, 2009
Expires: April 22, 2026
Assignee: TRUSTEES OF THE UNVIERSITY OF
Inventor: SKIRVIN ROBERT M; NORTON MARGARET A; FARRAND STEPHEN K; MULWA RICHARD M S

Abstract

A new and distinct transgenic grape plant Vitis vinifera called “Improved Chancellor” which is characterized by greater tolerance to 2,4-diphenoxyacetic acid than is the parent Chancellor grape plant.

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 grape plant named ‘Improved Chancellor’ as herein illustrated and described.

Read the full patent: US Plant Patent PP20428 in full — the complete specification, every figure, and the file history.