Electric heating – Heating devices – With heating unit structure
Patent
1985-12-17
1988-11-08
Goldberg, E. A.
Electric heating
Heating devices
With heating unit structure
219549, 219553, H05B 310
Patent
active
047835877
ABSTRACT:
A self-regulating heating article comprises a first elongate layer formed by a crystalline polymeric composition of high crystallinity and conductive particles dispersed in the polymeric composition to exhibit a positive temperature coefficient of resistance. A pair of elongate electrodes, which are adapted for connection to a mains supply, are secured one on each surface of the first layer to develop a potential in the direction of thickness of the first layer. The electrodes are arranged so that a creeping distance which is greater than the thickness of the first layer is established between the electrodes along peripheral edges thereof. The creeping distance prevents insulation breakdown and ensures safe, high wattage operation at mains voltages.
REFERENCES:
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patent: 3243753 (1966-03-01), Kohler
patent: 3397302 (1968-08-01), Hosford
patent: 3410984 (1968-11-01), Sandford et al.
patent: 3564199 (1971-02-01), Blaha
patent: 4177376 (1979-12-01), Horsma et al.
patent: 4317027 (1982-02-01), Middleman et al.
patent: 4517449 (1985-05-01), Chazan et al.
Funakoshi Yasutomo
Ishii Kazunori
Sakairi Tadashi
Terakado Seishi
Goldberg E. A.
Matsushita Electric - Industrial Co., Ltd.
Sigda C. M.
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