Industrial electric heating furnaces – Resistance furnace device – With heating element detail
Reexamination Certificate
2006-12-05
2006-12-05
Hoang, Tu (Department: 2832)
Industrial electric heating furnaces
Resistance furnace device
With heating element detail
C373S127000, C219S406000
Reexamination Certificate
active
07145932
ABSTRACT:
An electric furnace has a furnace wall, a cylindrical spiral member made of a wire of heat resistant material, a part of the cylindrical portion of which being embedded into the furnace wall and the remaining cylindrical portion of which being projected from an inner surface of the furnace wall, and a heating member inserted into the remaining cylindrical portion of the spiral member. The wire is wound along circles, ellipses, triangles, or quadrangles. The heating member has a circular, quadrangular, triangular or elliptical cross section.
REFERENCES:
patent: 2463329 (1949-03-01), Stansbury
patent: 3786162 (1974-01-01), Colson
patent: 4106179 (1978-08-01), Bleckmann
patent: 07183238 (1995-07-01), None
Sakaguchi Isao
Tanaka Tadayoshi
Boyle Fredrickson Newholm Stein & Gratz S.C.
Hoang Tu
Sakaguchi Dennetsu Kabushiki Kaisha
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