Telephone set having a volatile memory
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United States of America Patent
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-
Jan 26, 1993
Grant Date -
N/A
app pub date -
Oct 18, 1990
filing date -
Oct 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone set includes a volatile memory (14) for storing data such as telephone numbers or messages and a battery (17) for maintaining the data stored in the volatile memory (14). In order to prevent the data stored in the volatile memory (14) from being lost when the battery (17) is consumed, a detection circuit (18) detects the consumption of the battery (17) and supplies the voltage fed through a line from the telephone office side to the volatile memory (14) through a switch (19) on the basis of that detection. It is possible to transfer the data in the volatile memory to the non-volatile memory directly before the battery is consumed.
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