For our own reference we keep and maintain a detailed database of stevia varieties, which includes patented and non patented strains. Unfortunately we cannot share all information online, as we have exchanged variety characteristics with various organisations on a collegian basis, who have indicated they prefer this info not to be publicized online. What we can do however is refer you to some patented strains.
View: AKH-L1 PureCircle US20120090062
View: AKH-L4 PureCircle US20120090063
View: Brandle US6255557
View: Morita SF5 US6080561
View: Morita SF6 US6031157
View: Marsolais USPP10564 P