Electric heating – Heating devices – Combined with diverse-type art device
Patent
1983-01-31
1985-06-18
Bartis, A.
Electric heating
Heating devices
Combined with diverse-type art device
4218, 4219, 52219, 98 45, 98 58, 98 60, 137297, 138 33, 219280, 219301, 219359, 219535, H05B 100
Patent
active
045242623
ABSTRACT:
A plastic sewer vent line extending through the roof of a building is provided with a defroster for preventing blockage of the vent line by freezing and the consequent back-up sewage gas into the building. The defroster is located above the roof and includes a metal pipe, e.g., of copper, having its bottom end coupled to the plastic sewer vent line and provided with an electric heating coil in contact with a portion of the exterior thereof. An outer shell is spaced outwardly from and surrounds the exterior of the pipe and has a top sealed to the pipe top and a bottom sealed to the roof to provide an annular providing an insulating effect and enhancing the effectiveness of the heating element. A heat limiting switch is provided to prevent overheating.
REFERENCES:
patent: 387134 (1888-07-01), Benson et al.
patent: 745682 (1903-12-01), Shoenberg
patent: 749769 (1904-01-01), Wilson
patent: 917385 (1909-04-01), Wallace
patent: 921752 (1909-05-01), Ulrich et al.
patent: 1426187 (1922-08-01), Harrison
patent: 1759830 (1930-05-01), Blanchard
patent: 3120600 (1964-02-01), True
patent: 4110603 (1978-08-01), Peterson et al.
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