Patent ID: 6989732
Filing Date: 2006-01-24
Classification: E05B,G07C,Y10T

Abstract:
1. A method of operating an electronic lock box system, said method comprising: providing a lock box with a secure compartment therein, a shackle for attachment to a fixed object, a computer circuit, and an integral keypad; providing a portable memory device, which includes alterable memory elements; providing a communications link used for exchanging data between said portable memory device and said lock box computer circuit; coupling said portable memory device and said lock box in such a way so as to permit communication between the portable memory device and the lock box computer circuit through said communications link; transferring variable time sensitive lock authorization data from the portable memory device to the lock box computer circuit; and obtaining access to said secure compartment by way of said transferred variable time sensitive lock authorization data by conditionally unlocking said secure compartment upon a correct sequence of a plurality of switch closures entered on said lock box integral keypad, wherein: (a) said correct sequence of keypad switch closures is determined from said transferred variable time sensitive lock authorization data, and (b) said lock box computer circuit determines whether said variable time sensitive transferred lock authorization data received from the portable memory device is correct.