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US 4,639,712 AGranted
Sheathed heater
AssigneeNippondenso Co., Ltd.
InventorsAkihiro Kobayashi, Shunzo Yamaguchi, Kiyomi Kobayashi, Hiroaki Takaba
Life of this patent
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Abstract
A sheathed heater comprising a metallic sheath, such as a stainless steel sheath, an electric heating element disposed within the sheath so that an electric current can be supplied thereto, and a filling material filled in the sheath for insulating the heating element from the sheath and the coils of the heating element from each other. Aluminum nitride powder is used as the filling material to prevent oxidation of the heating element by the oxygen discharged from the filling material.
Claims3
A sheathed heater, comprising:
- a sheath;
- an electric heating element disposed within said sheath;
- and
- an electrically insulating filling material packed into said sheath for electrically insulating said electric heating element from said sheath, and for preventing electrical short-circuiting between spacedly-adjacent portions of said electric heating element within said sheath;
- said filling material being constituted by 80 mol percent or more of aluminum nitride powder, and 20 mol percent or less of a metallic oxide powder.
2 more elements
Dependencies are inferred from the claim text.