US Plant Patent PP23035
Star Cluster
Coreopsis plant named ‘Star Cluster’
UNDER PATENT
Still under patent. Protection ends April 8, 2031.
Twenty years from the filing date would end on March 9, 2031. This patent earned 30 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP23035
- Filed
- March 9, 2011
- Granted
- September 11, 2012
- Expires
- April 8, 2031
- Assignee
- PROBST DARRELL R
- Inventor
- PROBST DARRELL R
Abstract
A new cultivar of hybrid Coreopsis named ‘Star Cluster’ characterized by its large inflorescences with overlapping ray florets that are white in color with small purple eyezones that under cool growing temperatures develop larger eyezones and become suffused with purple first on the petal margins and then in the center of the petals, the ability to bloom from June until frost in Massachusetts, its heavy blooming habit, its well-branched sturdy stems, its vigorous growth habit with healthy foliage, and its reliably perennial habit with cold hardiness at least to U.S.D.A. Zone 5.
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 Coreopsis plant named ‘Star Cluster’ as herein illustrated and described.
Read the full patent: US Plant Patent PP23035 in full — the complete specification, every figure, and the file history.