US Plant Patent PP23690
Kui Nuku
Hibiscus plant named ‘Kui Nuku’
UNDER PATENT
Still under patent. Protection ends June 22, 2031.
Twenty years from the filing date would end on February 24, 2031. This patent earned 118 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP23690
- Filed
- February 24, 2011
- Granted
- June 25, 2013
- Expires
- June 22, 2031
- Assignee
- ZWETZIG GRETCHEN
- Inventor
- ZWETZIG GRETCHEN
Abstract
A new and distinct cultivar of winter hardy Hibiscus plant named ‘Kui Nuku’ is the result of a unique hybridization. This new and distinct cultivar is characterized primarily as to its novelty by its extreme cold hardiness to Zone 4, large thick-textured, magenta-pink flowers and its “Maple-shaped” leaves with a purple coloration, compactness of about 3 feet, its vigorous and uniform growth habit and its floriferous nature from midsummer until frost.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
It is claimed: 1. A new and distinct cultivar of hardy Hibiscus plant, as herein shown and described, characterized by its compact nature, refined purplish “maple-like” foliage of a purple coloration, its large bold, magenta-pink flowers, its vigor and its hardiness.
Read the full patent: US Plant Patent PP23690 in full — the complete specification, every figure, and the file history.