US Plant Patent PP21963
Wissahickon
Tiarella plant named ‘Wissahickon’
UNDER PATENT
Still under patent. Protection ends November 2, 2029.
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
- PP21963
- Filed
- November 2, 2009
- Granted
- May 31, 2011
- Expires
- November 2, 2029
- Inventor
- ADAM JR SINCLAIR A
Abstract
A new and distinct Tiarella cordifolia plant characterized by its glossy, deep green foliage and its white flowers that re-bloom throughout the summer.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct Tiarella plant as herein illustrated and described.
Read the full patent: US Plant Patent PP21963 in full — the complete specification, every figure, and the file history.