Patent ID: 8358195
Filing Date: 2013-01-22
Classification: A47G,G07C,Y10T

Abstract:
1. A delivery system comprising a combination lock providing access to a delivery space and an external delivery key generator processor; the lock comprising at least one means for inputting a delivery key, a processor for validating the delivery key, and a releasable latch that opens the lock in response to a valid delivery key, wherein the lock processor and the external delivery key generator processor each comprise a pseudo noise (PN) code generator that generates the same sequence of delivery keys, characterised in that the lock further comprises memory for storing used delivery keys, and in that the lock validating processor uses a recent valid delivery key to provide a pointer; the lock validating processor being programmed to: cause the pseudo noise (PN) code generator to generate a next delivery key after that pointer to compare with an input key and, if a match is not found, step the pointer forward through the sequence, and repeat a cycle of generating and matching with an input key for a predetermined number of cycles.