Diaper wetness signalling system

Details Diaper wetness signalling system Diaper wetness signalling system

1987-03-12

1988-08-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

128138A, G08B 2300

Patent

active

047680237

ABSTRACT:
This invention consists, in part, of a disposable diaper containing a pair of embedded electrodes terminated by a pair of conductive and adhesive tapes on the outer surface of the diaper.
This invention additionally consists of a compact diaper wetness signalling device contained in a housing and comprised of a CMOS voltage comparator with a reference voltage set by a Zener diode and a resistor, a voltage divider, a beeper, and a battery. The device has a pair of conductive contacts fixed into recesses on the outer surface of the housing, and the device can be detachably adhered to the conductive adhesive tapes. When the diaper is wet, the resistance across the two electrodes embedded in the diaper decreases, and this resistance decrease offsets the input voltage of the comparator, causing the beeper to be turned on.

REFERENCES:
patent: 4106001 (1978-08-01), Mahoney
patent: 4191950 (1980-03-01), Levin et al.
patent: 4212295 (1980-07-01), Snyder
patent: 4356818 (1982-11-01), Macias et al.
patent: 4484573 (1984-11-01), Yoo

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