Ceramic enveloped electrical heating element

Electrical resistors – Incased – embedded – or housed – With gaseous or vacuum spacing between element and casing or...

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13 25, 219354, 219553, 338234, 338318, H01C 1024

Patent

active

041032772

ABSTRACT:
An electrical heating element for ovens, furnaces and other infrared light applications comprises an elongate tubular envelope of thermally translucent refractory material such as pure alumina enclosing an elongate coiled refractory metal conductor which is capable of carrying a linear power loading of at least one hundred watts per inch. Refractory spacers along the coiled conductor and envelope hold the conductor spaced from the envelope and coaxial therewith so that the conductor attains heat in excess of the temperature limit of the envelope.

REFERENCES:
patent: 1947793 (1934-02-01), O'Neil et al.
patent: 2215587 (1940-09-01), Kerschbaum
patent: 2864025 (1958-12-01), Foote et al.
patent: 3428846 (1969-02-01), Rigden et al.
patent: 3448319 (1969-06-01), Louden
patent: 3538374 (1970-11-01), Kane
patent: 3571477 (1971-03-01), Phillips

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