Fraud prevention in an electronic coin telephone set

Details Fraud prevention in an electronic coin telephone set Fraud prevention in an electronic coin telephone set

1983-12-30

1986-11-25

Lev, Robert G.

Telephonic communications

With check operated control

Fraud or interference prevention

194317, H04M 1702

Patent

active

046250786

ABSTRACT:
This invention pertains to a microcomputer controlled coin telephone set which prevents coin call fraud and performs all of the coin discrimination functions. The microcomputer also checks the operational readiness of the telephone set to prevent the acceptance of coins into a hopper for late collection by a coin box unless or until the set is fully functional.

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patent: 4197425 (1980-04-01), Secrett et al.
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patent: 4358640 (1982-11-01), Murray
patent: 4436196 (1984-03-01), Crisp et al.
patent: 4469213 (1984-09-01), Nicholson et al.
patent: 4482787 (1984-11-01), Sagara et al.
patent: 4483431 (1984-11-01), Pratt
patent: 4488116 (1984-12-01), Plesko

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