System for the payment of telephone calls in a private self-switching unit
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United States of America Patent
Stats
-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Apr 11, 1989
filing date -
Jul 18, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A telephone system uses a badge which contains electronically stored data including information about pre-paid credits. When a call is made, data is read from and into the badge to leave a credit balance standing in the badge after the charges for a call have been deducted.
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