US Plant Patent PP15594
Barbara Harrington
Clematis plant named ‘Barbara Harrington’
PUBLIC DOMAIN
Patent expired March 19, 2023. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on March 15, 2023. This patent earned 4 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP15594
- Filed
- March 15, 2003
- Granted
- February 22, 2005
- Expires
- March 19, 2023
- Inventor
- HARRINGTON DOMINIC
Abstract
A new cultivar of Clematis named ‘Barbara Harrington’ that is characterized by intense deep purple flowers and a free flowering habit. In combination these traits set ‘Barbara Harrington’ apart from all other existing varieties of Clematis known to the inventor.
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 Clematis plant named ‘Barbara Harrington’ as described and illustrated.
Read the full patent: US Plant Patent PP15594 in full — the complete specification, every figure, and the file history.