US Plant Patent PP16839
Carmen
Rhododendron plant named ‘Carmen’
PUBLIC DOMAIN
Patent expired May 5, 2025. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on March 17, 2025. This patent earned 49 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP16839
- Filed
- March 17, 2005
- Granted
- July 18, 2006
- Expires
- May 5, 2025
- Assignee
- HORTIBREED NV
- Inventor
- VANDERHAEGEN JOHAN
Abstract
A new cultivar of Rhododendron plant named ‘Carmen’ that is characterized by vigorous growth, good leaf retention, double light pink flowers, a flower life of 3 to 4 weeks and winter hardiness to −10 degrees Centigrade.
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 Rhododendron plant named ‘Carmen’ as described and illustrated.
Read the full patent: US Plant Patent PP16839 in full — the complete specification, every figure, and the file history.