Patent ID: 9640004
Date: 2017-05-02
CPC Classifications: G07C,H04M,H04W,Y02D

Claim:
1. A method of operating a lock for a door from a portable remote device comprising: providing a lock controller having an antenna for receiving radio frequency signals, a microphone for receiving sound frequency signals, a microprocessor for processing a radio frequency identification signal received by the antenna and a sound frequency identification signal received by the microphone to determine if the signals emanate from an authorized user of the lock, and a device driver controllable by the microprocessor for operating the lock; sending a radio frequency identification signal from the portable remote device to the lock controller; receiving the radio frequency identification signal at the lock controller and using the microprocessor to determine whether the remote device is an authorized user of the lock; if the remote device is identified as an authorized user of the lock, sending a radio frequency signal from the lock controller to the remote device specifying a frequency, duration, and/or amplitude of the sound frequency identification signal to be sent from the portable remote device; subsequently sending the specified sound frequency identification signal from the portable remote device to the lock controller; receiving the sound frequency identification signal at the lock controller and using the microprocessor to determine whether the remote device is an authorized user of the lock; if the remote device is identified as an authorized user of the lock from both the radio frequency identification signal and the sound frequency identification signal, sending an authorization signal from the processor to the device driver authorizing unlocking of the lock; and after unlocking the door, deactivating operation of the lock in accordance with the radio or sound frequency identification signal.