US Plant Patent PP20013
Dark Towers
Penstemon plant named ‘Dark Towers’
UNDER PATENT
Still under patent. Protection ends December 10, 2027.
No term adjustment or disclaimer is recorded against this patent, so this is the full statutory term — twenty years from the filing date.

The record
- Patent number
- PP20013
- Filed
- December 10, 2007
- Granted
- May 19, 2009
- Expires
- December 10, 2027
- Assignee
- UNIV NEBRASKA LINCOLN BOARD OF
- Inventor
- LINDGREN DALE TENNIS
Abstract
A new and distinct Penstemon plant characterized by an upright, dense habit with very dark foliage, flowers of light purple shades, and excellent vigor.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct Penstemon plant as herein illustrated and described.
Read the full patent: US Plant Patent PP20013 in full — the complete specification, every figure, and the file history.