US Plant Patent PP26601
UMNAZ 502
Rhododendron plant named ‘UMNAZ 502’
UNDER PATENT
Still under patent. Protection ends June 30, 2034.
Twenty years from the filing date would end on January 14, 2034. This patent earned 167 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP26601
- Filed
- January 14, 2014
- Granted
- April 12, 2016
- Expires
- June 30, 2034
- Assignee
- UNIV MINNESOTA, HOKANSON STAN C, MCNAMARA STEVE
- Inventor
- HOKANSON STAN C; MCNAMARA STEVE
Abstract
A new cultivar of hybrid Rhododendron plant named ‘UMNAZ 502’ that is characterized by its irregularly rounded and compact plant habit reaching 1.4 m in height and width after 15 years of growth, its abundance of flowers that are dark red in color in mid to late May in Minnesota with the red color retained throughout the bloom period without substantial fading prior to abscission, its good cold hardiness with flower buds that are resistant to cold damage and consistently bloom even when exposed to temperatures as low as −30° F., and its good foliar tolerance to powdery mildew and other foliar diseases.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
It is claimed: 1. A new and distinct cultivar of Rhododendron plant named ‘UMNAZ 502’ as herein illustrated and described.
Read the full patent: US Plant Patent PP26601 in full — the complete specification, every figure, and the file history.