Skip to content
The Patent Garden

US Plant Patent PP18790

Blackadder

Blackcurrant plant named ‘Blackadder’

PUBLIC DOMAIN

Patent expired August 25, 2026. This plant is in the public domain — anyone may propagate and sell it.

No term adjustment or disclaimer is recorded against this patent, so this is the full statutory term — twenty years from the filing date.

Figure 1 of US plant patent PP18790, the photograph of Blackadder printed in the patent.
Figure 1 from US Plant Patent PP18790, 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
PP18790
Filed
August 25, 2006
Granted
May 6, 2008
Expires
August 25, 2026
Assignee
HORTICULTURE & FOOD RES INST
Inventor
SNELLING CATHERINE; LANGFORD GEOFFREY

Abstract

A new and distinct variety of blackcurrant named ‘Blackadder’, botanically identified as Ribes nigrum is described. The new variety is distinguished from others by its early season bud burst, flowering and harvest. Its bush has an upright habit suitable for machine harvesting. Yields are high and the fruit has high anthocyanin levels and moderate ascorbic acid levels.

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

1. A new and distinct blackcurrant plant named ‘Blackadder’ as herein illustrated and described.

Read the full patent: US Plant Patent PP18790 in full — the complete specification, every figure, and the file history.