Anti-fraud device for use with a coin operated telephone instrum

Details Anti-fraud device for use with a coin operated telephone instrum Anti-fraud device for use with a coin operated telephone instrum

1988-11-22

1989-08-29

Lev, Robert

Telephonic communications

With check operated control

Fraud or interference prevention

379132, 379155, H04M 1702

Patent

active

048624942

ABSTRACT:
An anti-fraud device is mounted internally within a coin-operated telephone to prevent fraudulent calling due to "pin fraud". The device includes circuitry which senses the presence of ground fraud conditions to disconnect the transmitting element from the telephone to prevent the defeat of a coin collect supervisory signal to cause coins temporarily held in the coin hopper to drop into the coin collection box rather than to be returned to the user.

REFERENCES:
patent: 2958732 (1960-11-01), Maguire
patent: 3668290 (1972-06-01), Robertson, Jr.
patent: 3676597 (1972-07-01), Peterson
patent: 4039768 (1977-08-01), O'Maley
patent: 4086439 (1978-04-01), Vowles et al.
patent: 4638121 (1987-01-01), Clark, Jr.
patent: 4794642 (1988-12-01), Arbabzadah et al.

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