Genus
Lentinula
7 US plant patents have been granted in this genus. 2 are already in the public domain — anyone may propagate and sell them. The next of the 5 still protected comes off patent on November 19, 2036.
Still under patent — 5 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- HOKSY 8PP29740Shiitake mushroom plant named ‘HOKSY 8’UNDER PATENTNovember 19, 2036
- FFT-52PP29815Shiitake mushroom plant named ‘FFT-52’UNDER PATENTJune 22, 2037
- HOKSY 10gokinPP32842Shiitake mushroom named ‘HOKSY 10gokin’UNDER PATENTFebruary 7, 2039
- Chikumasshu CS-2PP33887Shiitake mushroom named ‘Chikumasshu CS-2’UNDER PATENTSeptember 17, 2040
- HS911PP35498Shiitake mushroom named ‘HS911’UNDER PATENTFebruary 22, 2043
Already in the public domain — 2 cultivars
Most recently freed first. Anyone may propagate and sell these plants — though the name it is sold under may still be a live trademark.
- HS607PP12928Shiitake mushroom plant named ‘HS607’PUBLIC DOMAINOctober 23, 2020
- Hokken 601PP7339Shiitake mushroom plant named `Hokken 601`PUBLIC DOMAINJuly 18, 2008
A patent expiring frees the plant, and its cultivar name comes with it — cultivar names cannot be trademarked, so they are always free to use. What it does not free is any brand name the plant is marketed under. Those are trademarks and renew indefinitely.