Freezer alarm with extended life

Details Freezer alarm with extended life Freezer alarm with extended life

1977-05-23

1979-03-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340593, G08B 2100

Patent

active

041468864

ABSTRACT:
An alarm signal device sounded by a self-contained power source is activated responsive to a variance of temperature within a refrigerator or freezer beyond set limits. A timing circuit in the form of an integrated circuit causes the alarm to sound or flash intermittently for periods of extremely short duration compared to the relatively long periods between warning signals, thus extending the life of the alarm power source.

REFERENCES:
patent: 2984820 (1961-05-01), Kennell
patent: 3959787 (1976-05-01), Messmann et al.
patent: 4027302 (1977-05-01), Healey et al.

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