Telephone system

Details Telephone system Telephone system

1985-11-13

1987-11-10

Dwyer, James L.

Telephonic communications

With check operated control

Other than coin

379154, 379155, H04M 1702

Patent

active

047062754

ABSTRACT:
A telephone system enabling prepayment for telephone calls, wherein special code and credit information is stored in memory in special exchanges and debited as the call progresses.

REFERENCES:
patent: 3652795 (1972-03-01), Wolf et al.
patent: 3676597 (1972-07-01), Peterson
patent: 3938091 (1976-02-01), Atalla et al.
patent: 4439636 (1984-03-01), Newkirk et al.
patent: 4595983 (1986-06-01), Gehalo et al.

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