Patent ID: 7982436

Claim:
Power receiver apparatus for fitting onto an electrically powered device, which has a battery compartment equipped with battery power receiving contacts for receiving battery power from a battery positioned in the battery compartment and a plug receptacle for receiving electric power from an external source, to enable the electrically powered device to receive electric power from a recharging pad that has a flat power delivery surface comprised of a plurality of interdigitated flat, electrically conductive power delivery pads alternate ones of which are oppositely charged, comprising: a battery cover with an inside surface and an outside surface formed to fit and attach onto the electrical device in a manner that covers the battery and closes the battery compartment with the inside surface juxtaposed to the battery and the outside surface forming an external surface of the electrically powered device; a power delivery support structure mounted on the battery cover, wherein the power delivery support structure includes at least four electrically conductive contacts with proximal ends mounted on a circuit board to extend in spaced-apart relation to each other from the outside surface to respective distal ends that terminate in a common plane spaced apart from each other at distances set to enable at least two of the electrically conductive contacts to contact respectively oppositely charged ones of the power delivery pads when the electrically powered device is positioned on the flat power delivery surface, said circuit board also comprising a rectifier circuit connected electrically to the electrically conductive contacts and electric leads extending from the rectifier circuit for delivering power from the rectifier circuit to the electrically powered device, said circuit board, rectifier circuit, and proximal ends of the electrically conductive contacts being encapsulated for a hermetic seal.