Electric heating – Heating devices – With heating unit structure
Reexamination Certificate
2004-06-29
2008-10-21
Fuqua, Shawntina (Department: 3742)
Electric heating
Heating devices
With heating unit structure
C219S202000, C219S530000, C219S531000, C219S552000, C219S553000, C373S132000, C373S133000, C373S134000, C338S234000, C338S235000, C338S236000, C338S237000, C392S480000, C392S497000, C392S488000, C392S503000
Reexamination Certificate
active
07439473
ABSTRACT:
A method of supporting vertically hanging electrical resistance elements for heating furnaces or ovens in industrial operations. Each resistance element includes current-conducting legs that extend downward and upward a number of times, and the element includes along its length a number of ceramic discs that are provided with through-holes through which respective element legs extend. The upper part of the element merges with terminals that are connected to a source of electric current. The element is supported by at least one of the uppermost ceramic discs, wherein the uppermost ceramic disc supporting the element is placed in the insulation of the furnace roof above the underside of the roof. The legs of the element are short circuited at a location slightly or somewhat beneath the underside of the furnace roof with the aid of short circuiting plates.
REFERENCES:
patent: 4179603 (1979-12-01), Zeigler et al.
patent: 4392052 (1983-07-01), Magnusson et al.
patent: 5473141 (1995-12-01), Makris et al.
patent: 2643533 (1990-08-01), None
patent: 1509102 (1978-04-01), None
Fuqua Shawntina
Mangels Alfred J.
Sandvik Intellectual Property AB
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