Electric heating – Heating devices – With heating unit structure
Patent
1974-10-08
1982-09-14
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219510, 219523, 219541, 219552, 219534, 338240, 338242, 29615, H05B 344
Patent
active
043497276
ABSTRACT:
An elongated heater unit including an elongated resistor helix, terminals connected to the ends of the helix, at least a first surrounding metallic sheath, powder insulation material disposed within the first sheath and spacing the resistor helix from the sheath. The sheath is provided with at least one indentation and/or groove extending along at least a portion of the length of the first sheath. The method for constructing the heater unit includes forming the indentation by means of a roll with a protrusion, by utilizing a mandrel, by utilizing a temperature sensitive member or by utilizing a reducing sheath.
REFERENCES:
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patent: 1731119 (1929-10-01), Abbott et al.
patent: 2039641 (1936-05-01), Fichtner
patent: 2102783 (1937-12-01), Bokovoy
patent: 2157884 (1939-05-01), Bacher
patent: 2284862 (1942-06-01), Ginder
patent: 2389587 (1945-11-01), Appleman
patent: 2643317 (1953-06-01), Tuttle
patent: 3229358 (1966-01-01), Scadron et al.
patent: 3310657 (1967-03-01), Santoro, Jr.
patent: 3444356 (1969-05-01), Finn
patent: 3665598 (1972-05-01), Bricko
patent: 3770937 (1973-11-01), Smits
patent: 3898431 (1975-05-01), House et al.
Mayewsky Volodymyr Y.
Southport Enterprises, Inc.
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