Electric heating – Heating devices – With heating unit structure
Patent
1976-09-09
1978-08-15
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219381, 219543, 219553, 338 22R, H05B 308
Patent
active
041075153
ABSTRACT:
A compact resistor device comprises a body of ceramic material of positive temperature coefficient of resistivity having a large number of passages extending through the body between opposite ends of the body, thereby forming very thin webs of the resistor material between adjacent passages. Coatings are formed on the resistor material along the inner walls of the passages to serve as ohmic contacts. The coatings in alternate passages are connected together at one end of the resistor device and the coatings in the other passages are connected together at the opposite end of the device to serve as device terminals. When the device terminals are connected to a power source, current flows through very thin webs of resistor material between ohmic contacts in adjacent body passages. The resistor device is particularly useful in current limiting applications requiring low, room-temperature resistance and in heat-exchanger applications where a fluid to be heated is directed through the passages.
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patent: 3617695 (1971-11-01), Meyer et al.
patent: 3632971 (1972-01-01), Flanagan
patent: 3885129 (1975-05-01), Fabricius
patent: 3927300 (1975-12-01), Wada et al.
patent: 3956614 (1976-05-01), Hervert
patent: 3995143 (1976-11-01), Hervert
patent: 4032752 (1977-06-01), Ohmura et al.
patent: 4034207 (1977-07-01), Tamada et al.
Haug John A.
Mayewsky Volodymyr Y.
McAndrews James P.
Texas Instruments Incorporated
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