US Plant Patent PP21711
Biringer
Katsura tree named ‘Biringer’
UNDER PATENT
Still under patent. Protection ends June 4, 2029.
Twenty years from the filing date would end on May 26, 2029. This patent earned 9 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP21711
- Filed
- May 26, 2009
- Granted
- February 15, 2011
- Expires
- June 4, 2029
- Assignee
- BIRINGER NURSERY LP
- Inventor
- BIRINGER JOSEF
Abstract
‘Biringer’ Katsura is a newly and distinct variety of Katsura tree ( Cercidiphyllum japonicum ) having characteristics that are of commercial value in the nursery trade. As compared to Common Katsura, ‘Biringer’ Katsura has darker green summer foliage; narrower, more upright branch angles; a tendency to hold the leaves later in the autumn; and greater winter hardiness.
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 Katsura tree named ‘Biringer’ as herein described and illustrated.
Read the full patent: US Plant Patent PP21711 in full — the complete specification, every figure, and the file history.