US Plant Patent PP16715
P.N. 20-18
Pistachio rootstock tree named ‘P.N. 20-18’
PUBLIC DOMAIN
Patent expired July 13, 2024. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on March 23, 2024. This patent earned 112 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP16715
- Filed
- March 23, 2004
- Granted
- June 27, 2006
- Expires
- July 13, 2024
- Assignee
- ANDERSON III HENRY P, PURYEAR KENNETH L
- Inventor
- ANDERSON III HENRY P; PURYEAR KENNETH L
Abstract
A new and distinct variety of pistachio tree, characterized by the rounded and upright growth of the plant and the glabrous and leathery characteristic of the foliage, which is particularly useful as a rootstock upon which commercial nut bearing pistachio varieties may be budded or grafted.
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 pistachio tree, identified as ‘P.N. 20-18’, substantially as shown and described.
Read the full patent: US Plant Patent PP16715 in full — the complete specification, every figure, and the file history.