Telephone set having a volatile memory

Details Telephone set having a volatile memory Telephone set having a volatile memory

1990-10-18

1993-01-26

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379413, 379355, 379356, H04M 100

Patent

active

051827697

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.

REFERENCES:
patent: 4339632 (1982-07-01), Early et al.
patent: 4380687 (1983-04-01), Stewart
patent: 4532382 (1985-07-01), Pommer, II
patent: 4560841 (1985-12-01), Pierrel
patent: 4636587 (1987-01-01), Zoerner
patent: 4636588 (1987-01-01), Nakayama et al.
patent: 4647787 (1987-03-01), Pommer, II
patent: 4653088 (1987-03-01), Budd et al.
patent: 4763333 (1988-08-01), Byrd
patent: 4922529 (1990-05-01), Kiel
patent: 5034915 (1991-07-01), Styrna et al.

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