US Plant Patent PP16397
Kerbelcob
Primula plant named ‘Kerbelcob’
PUBLIC DOMAIN
Patent expired March 27, 2025. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on January 28, 2025. This patent earned 58 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP16397
- Filed
- January 28, 2005
- Granted
- March 28, 2006
- Expires
- March 27, 2025
- Assignee
- KERLEY DAVID W, KERLEY PRISCILLA G
- Inventor
- KERLEY DAVID W; KERLEY PRISCILLA G
Abstract
A new and distinct cultivar of Primula plant named ‘Kerbelcob’, characterized by its upright, compact and uniform plant habit; large, double, fragrant and intense violet blue-colored flowers that are held upright on strong and erect peduncles; freely flowering habit; and tolerance to low temperatures.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct cultivar of Primula plant named ‘Kerbelcob’, as illustrated and described.
Read the full patent: US Plant Patent PP16397 in full — the complete specification, every figure, and the file history.