Sheathed heater

Details Sheathed heater Sheathed heater

1992-02-21

1993-03-30

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219523, 219534, 338238, 338243, H05B 348, H05B 346

Patent

active

051986418

ABSTRACT:
A sheathed heater wherein before the sheathed heater is assembled, an oxide film is formed on the inner peripheral surface of a metal pipe, and/or the outer surfaces of an internal heater and lead pins thereof which are inserted into the metal pipe by heating them in the presence of oxygen or by applying chemicals thereto, and a heat resistent insulation material member is filled in a space formed between the metal pipe and the internal heater. The color of the oxide film thus formed is light brown, brown or black.

REFERENCES:
patent: 2916594 (1959-12-01), Sawyer
patent: 3476916 (1969-11-01), La Vaw
patent: 3839623 (1974-10-01), Portmann
patent: 4280046 (1981-07-01), Shimotori et al.
patent: 4742324 (1988-05-01), Shida et al.

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