US Plant Patent PP33887
Chikumasshu CS-2
Shiitake mushroom named ‘Chikumasshu CS-2’
UNDER PATENT
Still under patent. Protection ends September 17, 2040.
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
- PP33887
- Filed
- September 17, 2020
- Granted
- January 18, 2022
- Expires
- September 17, 2040
- Assignee
- CHIKUMAKASEI CO LTD
- Inventor
- IKEDA TADAO
Abstract
A new variety of shiitake mushroom that has a medium density, late growth according to temperature, an overall scaled cap, an average length of time from spawning to fruiting, and high yield at second and third month.
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 shiitake mushroom as described and illustrated.
Read the full patent: US Plant Patent PP33887 in full — the complete specification, every figure, and the file history.