Device for starting charging in a pay phone

Details Device for starting charging in a pay phone Device for starting charging in a pay phone

1987-11-17

1989-10-10

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 23, 379146, 379155, H04K 100

Patent

active

048737216

ABSTRACT:
The present invention relates to a device for starting telephone charging in a pay phone.
The starting device essentially comprises a scrambler circuit (42) which is inserted in the line (26) when the handset is taken off-hook and which is inhibited only when the user actuates a pushbutton (20), and a microphone inhibit circuit (40) which is inserted when the user dials the called number and which inhibits simultaneously with the circuit (42). Charging begins when the button (20) is actuated.

REFERENCES:
patent: 3982073 (1976-09-01), Baltzer et al.
patent: 4039768 (1977-08-01), O'Malley
patent: 4074079 (1978-02-01), Prell et al.
patent: 4198545 (1980-04-01), Haist et al.
patent: 4499556 (1985-02-01), Halpern
patent: 4567325 (1986-01-01), Crouch et al.
patent: 4698840 (1987-10-01), Dively et al.
patent: 4760594 (1988-07-01), Reed
patent: 4787045 (1988-11-01), Storace et al.

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