US Plant Patent PP20097
St. Croix
American elm tree named ‘St. Croix’
UNDER PATENT
Still under patent. Protection ends February 9, 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
- PP20097
- Filed
- February 9, 2007
- Granted
- June 16, 2009
- Expires
- February 9, 2027
- Assignee
- UNIV MINNESOTA, ELM TREE FARM LLC
- Inventor
- BLISKA CHRISTIAN; BLISKA PATRICIA; STENNES MARK; GIBLIN CHAD
Abstract
A new and distinct variety of American elm tree, particularly distinguished by substantial tolerance to an epiphytotic and normally deadly vascular wilt disease of the genus Ulmus known as Dutch elm disease.
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 American elm tree named ‘St. Croix’ substantially as illustrated and described.
Read the full patent: US Plant Patent PP20097 in full — the complete specification, every figure, and the file history.