As some of you probably know, the iPhone 3GS was the first smartphone in Apple's portfolio to get an oleophobic coating on its display, thanks to which it had the tendency of collecting less finger smudge than an ordinary touchscreen. The trouble with the technology, however, is that the coating wears off over time. This is where the patent that we are introducing to you today comes in handy as it will rejuvenate the oleophobic properties on the display of any iDevice through a process called Physical Vapor Desposition. In a nutshell, the fingerprint-resistant chemical can be deposited onto the device's screen in a liquid form whenever that is required. The chemical itself can be held in a pressurized container inside of the device.
source: USPTO via Gizmodo