How seriously is Apple considering the possibility of adding inductive charging to its line of iOS devices? Seriously enough to submit some crudely drawn images to the USPTO, at least. The company's application for "Using an Audio Cable as an Inductive Charging Coil" surfaced today, featuring some interesting solutions to the problem of inductive charging. The first looks a bit like an iPhone scratching post. It's a big monolith you wrap an audio cord around several times, effectively turning the cable into an inductive receiving coil. The earphones in the example have a metal mesh that serve as a contact for charging the device.