Electric heating – Heating devices – With heating unit structure
Patent
1978-06-13
1979-07-10
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219464, 219552, 338288, 338297, 338300, H05B 316
Patent
active
041608976
ABSTRACT:
In a ceramic heating element comprising a ceramic substrate having on a surface thereof a resistor pattern of an electrically conductive material and a ceramic electrically insulating layer disposed on the surface of the ceramic substrate with the resistor pattern thereon, the improvement wherein the ceramic electrically insulating layer includes an opening, the resistor pattern exposed by the opening in the ceramic electrically insulating layer being electrically shorted and/or an electrical short-circuiting path previously provided in the resistor pattern being cut whereby the resistivity of the resistor pattern is adjusted to within a particular range, and a heat resistant electrically insulating coating filling the opening in the ceramic electrically insulating layer.
REFERENCES:
patent: 1563731 (1925-12-01), Ducas
patent: 2703833 (1955-03-01), Vanvor
patent: 2710900 (1955-06-01), Linder
patent: 2744987 (1956-05-01), Marvin
patent: 2915613 (1959-12-01), Norton
patent: 3283285 (1966-11-01), Zuk
patent: 3496336 (1970-02-01), Hingorany et al.
patent: 3881162 (1975-04-01), Caddock
patent: 3912905 (1975-10-01), Giler
Mayewsky Volodymyr Y.
NGK Spark Plug Co. Ltd.
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