Electric heating – Heating devices – Combined with diverse-type art device
Patent
1975-04-17
1977-06-28
Bartis, A.
Electric heating
Heating devices
Combined with diverse-type art device
52171, 219491, 219508, 219509, 219522, 340235, H05B 102, E06B 712
Patent
active
040327450
ABSTRACT:
Apparatus for controllably heating a vehicle window having a heating grid is described including an oscillator and a signal detector, with a signal circuit coupling the oscillator and the signal detector having a DC voltage component at one or more points thereof. One or more humidity detectors are coupled to the signal circuit to control the amplitude of the oscillations supplied from the oscillator to the signal detector, advantageously by voltage divider action, and capacitor means provides DC isolation between the humidity detector(s) and any DC voltage component in the signal circuit, and also between humidity detectors when a plurality are used. Advantageously the humidity detector(s) are directly connected to the heating grid, and varying DC voltage levels at the point(s) of connection to the grid are isolated by the capacitor means. Particular arrangements of the humidity detectors on the window and connections to the heating grid are described.
REFERENCES:
patent: 3696360 (1972-10-01), Gajewski
patent: 3902040 (1975-08-01), Ikeda et al.
patent: 3934111 (1976-01-01), Roselli et al.
patent: 3968342 (1976-07-01), Inaba
Bartis A.
Saint-Gobain Industries
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