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US 4,736,444 AGranted
Pay telephone monitoring system
AssigneeTel-Tech Devices, Inc.
InventorRobert Dhein
Life of this patent
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Abstract
A passive, non-intrusive pay telephone monitoring system is disclosed for maintaining a talley of the amount of money present in a money box. A signal is sent over the line, interconnecting the pay telephone with its central office equipment when money in the box is collected by a collection agent, and the collected amount of money and the time of collection are then stored for verification of the collected amount.
Claims34
A system for monitoring the operation of a pay telephone connected to a central office exchange by means of telephone line, said system comprising:
- means for detecting signals on said telephone line generated by said pay telephone when money is deposited in said pay telephone;
- means for determining from said signals generated by said pay telephone the amount of money which is deposited;
- means for detecting signals on said line representing a return of said deposited money to a user or the collection of said deposited money into a money box;
- means for storing the cumulative amount of money residing in a money box of said telephone and for augmenting said cumulative amount with said deposited amount of money when a signal on said line representing the collection of said deposited money is detected;
- means for detecting a signal on said telephone line representing the collection of money from said money box;
- and
- means for storing said cumulative amount of money as an amount of money collected and for storing a time of collection of said collected amount when said signal representing collection of money from said money box is detected.
4 more elements
Dependencies are inferred from the claim text.