Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-01-13
1998-08-18
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340605, 429118, G08B 2100
Patent
active
057963452
ABSTRACT:
This invention describes a sensing device useful as a wet condition indicator, and is composed of a sensing element that produces electric energy when it becomes wet, and an informing means such as an integrated circuit/piezoelectric buzzer (speaker), light source or electrochromic device. The sensing element incorporates small amounts of non-toxic, non-allergenic substances and operates as a battery when wet. That battery produces enough electric energy to power the informing device without need of any other circuitry or batteries. This has the advantage of lower cost so that it can be used for a wet condition indicator in disposable diapers. One sensing element is incorporated in each diaper, and can be discarded with it, while the informing element is reused.
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Steven S. Zumdahl, Chemical Principles, Chapter 11 -Electrochemistry, Section 11.5 -Batteries, (1992 D.C. Heath and Company, Lexington, Massachusetts), pp. 444-446.
Galison William A.
Leventis Nicholas
Hofsass Jeffery A.
Huang Sihong
Shiells Theodore F.
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