Resistance furnace with tubular heating element

Details Resistance furnace with tubular heating element Resistance furnace with tubular heating element

2006-02-28

2006-02-28

Hoang, Tu (Department: 3742)

Industrial electric heating furnaces

Resistance furnace device

With internal atmosphere control

C373S125000

Reexamination Certificate

active

07006552

ABSTRACT:
A resistance furnace has a tubular heating element with a vertically-oriented longitudinal axis. The heating element has a shell surface defined by an upper side and a lower side and surrounding a furnace chamber. The heating element is connected to at least two supply terminals by which heating current is introduced at power supply points into the heating element. The supply terminals include a surrounding upper annular collar adjacent the upper side of the shell surface, and also a surrounding lower annular collar adjacent the lower side of the shell surface.

REFERENCES:
patent: 715509 (1902-12-01), Potter
patent: 1023309 (1912-04-01), Helberger
patent: 2121744 (1938-06-01), Ridgway et al.
patent: 3139474 (1964-06-01), Weech et al.
patent: 3170018 (1965-02-01), Lewis
patent: 4549345 (1985-10-01), Wilsey
patent: 4703556 (1987-11-01), Wilsey
patent: 5864576 (1999-01-01), Nakatani et al.
patent: 500 555 (1920-03-01), None

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