US Plant Patent PP4575
Rhubarb plant - K-1 variety
PUBLIC DOMAIN
Patent expired April 11, 1999. This plant is in the public domain — anyone may propagate and sell it.
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
- PP4575
- Filed
- April 11, 1979
- Granted
- July 15, 1980
- Expires
- April 11, 1999
- Assignee
- STARK BROTHERS NURSERIES & ORC
- Inventor
- KRIEGER LARRY A
No cultivar name of record
This patent does not name the plant. Through the 1980s and early 1990s that was still common: naming every new cultivar only became standard practice as plants began to be marketed under brand names. The grant identifies this one by its number and by a written description instead.
Nothing here is missing from our records: the patent itself states no name. Where one exists we show it, and we do not invent one.
Abstract
A new and distinct variety of rhubarb plant is provided which originated as a mutation of the Valentine variety. This new variety is characterized by stalks of extremely large diameter, stalks which are red on both the inside and on the outside, tender stalks which cook-up well in the absence of strings and which require a substantially lesser quantity of sugar during processing, prominent leaf ribs, and the absence of seed stalks. This variety has been named the K-1 variety.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
I claim: 1. A new and distinct variety of rhubarb plant which is a mutation of the Valentine variety, substantially as illustrated and described, characterized by stalks of extremely large diameter, stalks which are red on both the inside and on the outside, tender stalks which cook-up well in the absence of strings and which require a substantially lesser quantity of sugar during processing, prominent leaf ribs, and the absence of seed stalks.
Read the full patent: US Plant Patent PP4575 in full — the complete specification, every figure, and the file history.