Exothermic device for providing substantially constant heat agai

Details Exothermic device for providing substantially constant heat agai Exothermic device for providing substantially constant heat agai

1994-05-24

1996-07-30

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219504, 219481, 338 22R, H05B 102

Patent

active

055413897

ABSTRACT:
Positive temperature coefficient thermistor is prepared from a sintered body of a ceramic material composition which has as a substrate BaTiO.sub.3 with metallic oxide. There is almost no difference of exothermic temperature even if different voltage is applied to the positive temperature coefficient thermistors. Thus, when the present invention is used in countries or areas in which both 110 V and 220 V of commercial voltages are used, almost certain temperature can be obtained without changing voltage by a transformer.

REFERENCES:
patent: 4505803 (1985-03-01), Mase et al.
patent: 4544829 (1985-10-01), Adachi et al.
patent: 4628183 (1986-12-01), Satomura
patent: 4787135 (1988-11-01), Nagahori

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