Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1997-05-28
1999-06-08
Walberg, Teresa
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219535, 219549, 29611, 338298, 338282, H05B 334, H05B 358, H05B 300, H01C 316
Patent
active
059102667
ABSTRACT:
The invention is in the field of electrical resistance heaters, especially heaters for tubes, pipes, or flexible hose. More particularly, the invention is directed to an electrical heater formed as a strip that is permanently set in the shape of a helix. According to an aspect of the invention, an electrical heater is provided comprising a flexible electrical insulation strip bounded by a first longitudinal edge and a second longitudinal edge, wherein the flexible electrical insulation strip is permanently set as a helix such that the first longitudinal edge is adjacent to the second longitudinal edge; and, a flexible electrical heating element encapsulated within the electrical insulation strip.
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Watlow Electric Heaters & Controls, St. Louis, MO., Silicone Rubber Heaters, Application Guide & Stock List, Bulletin #250, 8 pages. (date unknown).
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Electrofilm Mfg. Co., Valencia, CA., Product Broshure on Heating Elements, 3 double-sided pages, Thomas Register. (date unkown).
Leffel Kevin L.
Paik Sam
The B.F. Goodrich Company
Walberg Teresa
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