There is no patent on the XT90 connector, we hope this product is sold everywhere in the world and dominates the market, reducing customers dependency on the over-priced Deans T-connector. Say 'No' to the Deans Connector profiteers, and use XT-90's! IMPORTANT These are not cheap copied XT90 plugs. These original Nylon XT90 plugs can handle over 60A current for extended periods without exceeding 80DegC thanks to their better contact surface area. The plug is also less likely to deform or melt in comparison to copied non-Nylon XT90 plugs. Genuine Nylon high-temp XT90 connectors. XT = heXTronik. 90 = 90A constant. We're the guys that designed this plug!