Heating apparatus

Details Heating apparatus Heating apparatus

1992-02-28

1993-07-20

Walberg, Teresa J.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219388, H05B 364

Patent

active

052295761

ABSTRACT:
A heating apparatus provided with a double layered heat-insulating material. This heat-insulating material includes an inner layer portion constituted by an alumina fiber/inorganic filler/inorganic binder and having a bulk density of 0.3 to 0.8 g/cm.sup.3, and an outer layer portion integrally laminated on the inner layer portion, and constituted by an alumina silica fiber/ inorganic binder and having a bulk density of 0.2 to 0.4 g/cm.sup.3 which is smaller than that of the inner layer portion.

REFERENCES:
patent: 3361863 (1968-01-01), Lang
patent: 4699084 (1987-10-01), Wilson
patent: 4857489 (1989-08-01), Bearden
patent: 5038019 (1991-08-01), McEntire

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