Coin telephone system having restricted coin-free dialing capabi

Details Coin telephone system having restricted coin-free dialing capabi Coin telephone system having restricted coin-free dialing capabi

1975-12-08

1977-12-13

Cooper, William C.

179 18DA, H04M 1702

Patent

active

040630366

ABSTRACT:
A conventional telephone pay station is adapted for coin-free restricted dialing of a preselected number of digits by employing a two-coil latching relay operating a switch for shunting outgoing calls, one coil being operated after a predetermined time delay responsive to detection of an offhook condition to open the switch, and the second coil being operated responsive to the detection of dialing by the calling party of a number of digits greater than the preselected number to close the switch. Anti-fraud circuits are provided to interrupt tone generator operation after a predesignated time delay following each digit, and to interrupt service after each hook switch operation.

REFERENCES:
patent: 2912512 (1959-11-01), Pye
patent: 3678203 (1972-07-01), Lorange
patent: 3992588 (1976-11-01), Hunsicker

Affiliated with

Also associated with

Rating

Coin telephone system having restricted coin-free dialing capabi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coin telephone system having restricted coin-free dialing capabi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coin telephone system having restricted coin-free dialing capabi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-490076