While Appe's latest handheld devices include pseudo-touchless capabilities via the TrueDepth 3D camera system, it still requires touch sensors for the display itself. Microsoft's newly approved patent does away with the display sensors and relies only on depth map imaging to calculate the cursor position and hand gestures.
https://www.notebookcheck.net/Microsoft-could-introduce-Touchless-Input-in-future-Surface-devices.316478.0.html