Solid state thermistor switch

Details Solid state thermistor switch Solid state thermistor switch

1975-08-04

1977-01-04

Caldwell, John W.

Communications: electrical

Systems

Call station

73295, 200 84R, 340274R, G08B 2100

Patent

active

040018024

ABSTRACT:
A switch includes a self-heating thermistor which has a certain resistance value when exposed to a medium of low thermal conductivity and a thermally conductive solid for movement into contact with the thermistor to lower its temperature and change its resistance. The solid is moved relative to the thermistor in response to any mechanical movement such as a float responding to liquid level or the closure of a door.

REFERENCES:
patent: 2741468 (1956-04-01), Alspaugh
patent: 3246210 (1966-04-01), Lorenz
patent: 3631440 (1971-12-01), Cliffgard
patent: 3756524 (1973-09-01), Felix
patent: 3896658 (1975-07-01), Hahn

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