Electric heating – Heating devices – With heating unit structure
Patent
1986-06-04
1987-10-20
Goldberg, E. A.
Electric heating
Heating devices
With heating unit structure
219335, 219336, 219437, 338238, 338243, 338273, 338274, 29611, 29614, 29615, H05B 344, H01C 102
Patent
active
047015993
ABSTRACT:
An improved copper sheathed heating element for installation in appliances, such as electric kettles, includes a minor amount of a silicone water-proofing agent admixed with magnesium oxide filler agent prior to the element being annealed. Annealing of the element is carried out at a reduced annealing temperature over an extended duration in order to limit thermal degradation of the additive during the annealing process. The resulting element achieves sufficient ductility for purposes of formation as a kettle heating element, while the insulation value of the element over an extended shelf life is maintained without significant degradation. Preferably, the silicone agent comprises polydimethylsiloxane and is present in the range 0.1 to 0.15 percent by weight.
REFERENCES:
patent: 3412358 (1968-11-01), Hummel et al.
Bartlett Edward D. C.
Black & Decker Inc.
Goldberg E. A.
Lerner Paul J.
Murphy Edward D.
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