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US 4,052,691 AGranted
Humidity sensor
AssigneeAsahi Glass Company, Limited
InventorsKentaro Nagano, Koji Nomaki, Yukinori Kutsukake, Junji Nanao
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Abstract
A humidity sensor comprising a pair of spaced electrodes on an insulating substrate is formed by coating an orthophosphate as a sensitive membrane over at least a portion of the gap between the electrodes.
Claims10
A humidity sensor for detecting condensed moisture, which comprises:
- a pair of spaced electrodes disposed on an insulating substrate;
- and a moisture sensitive membrane of an orthophosphate which at least partially covers the gap between said electrodes.
A defogging glass plate, which comprises:
- an insulating substrate deposited on a glass plate to be defogged;
- a humidity sensor on said insulating substrate which comprises a pair of spaced electrodes with a moisture sensitive membrane of an orthophosphate at least partially covering the gap between said spaced electrodes;
- and
- an electric heating element connected to said humidity sensor, such that activation of said electric heating element is controlled by variation of the impedance between said electrodes.
1 more element
Dependencies are inferred from the claim text.