Back to results
US 4,039,768 AGranted
Pay telephone station monitor system
OwnerJames B. O'Maleyinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerJames B. O'Maleyinventor
Estimating the term…
A pay telephone station monitor system which monitors the operation of a pay telephone station and detects malfunction of the pay station equipment. An alarm signal is produced upon detection of such malfunction which signal is transmitted to a central office to produce a visual output display upon predetermined occurrences of the alarm signals. The monitor system senses the impedances of the transmitter and receiver elements in the handset of the telephone, the time delay between removing the handset from the cradle and the occurrence of dial tone, and the delay between the onset of dial tone and dial tone break. The central office equipment produces a hierarchy of visual indications indicative of the number of times faults have occurred, and also gives a time reading since the occurrence of an initial fault or since the last successful use of the pay station. A coin box monitor can also be included to detect the height of coins in a coin box and transmit a signal to the central office when a predetermined height has been reached.
In a pay telephone station coupled to a central office through telephone lines, a fault alarm system comprising:
A fault detection system for a pay telephone station connected to a telephone line comprising detecting means for determining a malfunction of the pay station equipment, and alarm means responsive to said detecting means for producing an alarm signal indicating such malfunction, and wherein the pay telephone station equipment includes a handset having transmitter and receiver elements, and wherein said detecting means includes monitoring means for checking the proper values of the impedance of said transmitter and receiver elements.
A fault monitor system connected at a telephone central office for monitoring the operation of a pay telephone station connected by telephone lines to the central office and comprising:
A coin box monitor for a pay telephone station connected to a telephone line comprising:
Dependencies are inferred from the claim text.