Industrial electric heating furnaces – Resistance furnace device – With heating element detail
Patent
1987-04-06
1988-04-26
Envall, Jr., Roy N.
Industrial electric heating furnaces
Resistance furnace device
With heating element detail
H05B 300
Patent
active
047409916
ABSTRACT:
A crucible of a resistive material has a smoothly rounded inner bottom and a radially outer portion of the outer bottom having a rounded shape. The shape of the outer bottom bears a predetermined relationship to the shape of the inner bottom. In one embodiment of the invention, the outer bottom and inner bottom have a common radius of curvature, whereby the thickness of material between the outer and inner bottom is constant. In a second embodiment of the invention, the centers of curvature differ, whereby the resistivity of material at differing radii is tailored.
REFERENCES:
patent: 4403955 (1983-09-01), Sarno
Carbone, USA Corp.
Envall Jr. Roy N.
Morrison Thomas R.
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