It is still a registered trademark, but "Kleenex" has been genericized: https://en.wikipedia.org/wiki/Kleenex#Kleenex_Trademark https://en.wikipedia.org/wiki/K

It is still a registered trademark, but "Kleenex" has been genericized: https://en.wikipedia.org/wiki/Kleenex#Kleenex_Trademark https://en.wikipedia.org/wiki/Kleenex#Kleenex_Trademark I do not know if that is due to their not defending the trademark or what the precise legal status is, though.