Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1976-02-05
1978-08-29
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
137341, 138 33, 219 1051, 219300, H05B 300, F16L 5300
Patent
active
041105990
ABSTRACT:
The heat output over a segment of a heat generating pipe of the type comprising an elongated ferromagnetic pipe having an insulated conductor extending therethrough up to a given point with both the pipe and the conductor connected in series with a source of alternating current is reduced by making the pipe segment of a non-ferromagnetic material, e.g., aluminum. Dielectric unions can be used to couple the non-ferromagnetic pipe segment into the ferromagnetic pipe, in which case means are provided to electrically bypass the dielectric unions in order to maintain the series circuit through the conductor, ferromagnetic pipe and the non-ferromagnetic segment. Alternatively, the non-ferromagnetic segment can be connected directly is series with the ferromagnetic pipe.
REFERENCES:
patent: 3293407 (1966-12-01), Ando
patent: 3575581 (1971-04-01), Ando
patent: 3629551 (1971-12-01), Ando
patent: 3632975 (1972-01-01), Ando
patent: 3632976 (1972-01-01), Ando
patent: 3780250 (1973-12-01), Ando
Bartis A.
Chevron Research Company
Egan, III William J.
Freeland, Jr. R. L.
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