Moisture detector

Details Moisture detector Moisture detector

1979-02-02

1981-01-20

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6104, 340604, G08B 2100

Patent

active

042465753

ABSTRACT:
A compressed dehydrated cellulose sponge wafer has conductive plates attached to opposing faces. A bridging conductor electrically connects the two plates together upon swelling of the wafer responsive to its contact with moisture. One edge of the sponge is treated with adhesive so as to form a hinge. The wafer opens like a book upon contact with moisture forcing the extending plates into contact.

REFERENCES:
patent: 2432367 (1947-12-01), Andresen
patent: 3200388 (1965-08-01), Uhlig
patent: 3562731 (1971-02-01), Hsu

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