Patents start from the day they are applied from, right? They just kept it secret until they applied for it. So the patent starts from 2020.
Anyway, I wonder how important that patent https://patents.google.com/patent/KR20210062550A/en is in the end, as it seems their way of manufacturing it is not very effective anyway and it might even be possible to find nearby compounds with similar properties.
Anyway, I wonder how important that patent https://patents.google.com/patent/KR20210062550A/en is in the end, as it seems their way of manufacturing it is not very effective anyway and it might even be possible to find nearby compounds with similar properties.