A portable dual-mode scanner device capable of being powered through a universal serial bus connection where the individual components of the portable scanner are selectively and controllably powered so as to function within the power limitations of the usb port (i.e., 5 Volts, 2.2 watts) without appreciable...http://www.google.ca/patents/US6459506?utm_source=gb-gplus-sharePatent US6459506 - Lightweight dual-mode mobile scanner powered from a universal serial bus port
