Electric heating – Heating devices – With heating unit structure
Patent
1997-03-25
2000-09-12
Walberg, Teresa
Electric heating
Heating devices
With heating unit structure
219216, H05B 306, H05B 100
Patent
active
061181099
ABSTRACT:
A heating device includes a substrate made of a heat-resistant insulating material, a heating resistor formed on the substrate, and a protective glass coating formed on the substrate to cover the heating resistor. The protective glass coating is formed of a glass material containing, as an additive, 3.about.40 wt % of alumina powder which has an average grain size of 0.5.about.2.0 .mu.m.
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Robinson Daniel
Rohm & Co., Ltd.
Walberg Teresa
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