US Plant Patent PP36538
WW Warren
Red maple tree named ‘WW Warren’
UNDER PATENT
Still under patent. Protection ends May 14, 2044.
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
- PP36538
- Filed
- May 14, 2024
- Granted
- March 11, 2025
- Expires
- May 14, 2044
- Assignee
- J FRANK SCHMIDT & SON CO
- Inventor
- WARREN KEITH S
Abstract
A new variety of red maple with a unique combination of characteristics, combining a fast growth rate tightly fastigiate branching habit. an extremely narrow to columnar form, small leaves with long acuminate tips that produce a delicate appearance, and bright red fall color.
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 red maple tree named ‘WW Warren’. substantially as illustrated and described herein.
Read the full patent: US Plant Patent PP36538 in full — the complete specification, every figure, and the file history.