Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-12-01
1991-02-19
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219505, 219522, 219541, 219203, 361104, H05B 102
Patent
active
049946501
ABSTRACT:
An electric field detector for a heatable windshield includes detector lines which extend around a portion of the perimeter of the windshield between the edge of the windshield's electroconductive coating and the leads to one of the windshield bus bars and are electrically insulated from the coating, bus bars and leads. The detector lines are electrically interconnected to the coating by a tab at a predetermined location between the bus bars. As electrical current passes through the coating, voltage in the coating at the predetermined location is monitored and the current to the coating is interrupted in response to predetermined variations in the measured coating voltage.
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Lepiane Donald C.
Paschall M. H.
PPG Industries Inc.
Siminerio Andrew C.
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