Bus bar arrangement for an electrically heated transparency

Details Bus bar arrangement for an electrically heated transparency Bus bar arrangement for an electrically heated transparency

1987-12-28

1989-04-11

Bartis, Anthony

Electric heating

Heating devices

Combined with diverse-type art device

52171, 219345, 219522, 219543, 219547, 338309, H05B 326, E06B 712, B60J 120

Patent

active

048209023

ABSTRACT:
An electrically heated transparency such as may be employed in a vehicle to provide defrosting, deicing, or defogging capability for the vehicle windows includes a transparent, electroconductive, heat-producing coating, e.g., a film including silver, on a major surface of a transparent sheet, e.g., a glass sheet. First and second bus bars contact the coating along first and second opposite edge portions of the transparency. A pair of electroconductive extensions extend from opposite ends of the second bus bar to a location near the first edge portion along third and fourth edge portions of the transparency, with the extensions being electrically insulated from the coating and the first bus bar. Terminal areas of the extensions and the first bus bar are connected to a power source. The extensions reduce the power losses in the bus bars, produce a more uniform heating pattern, and provide redundancy should one of the extensions fail.

REFERENCES:
patent: 3379859 (1968-04-01), Marriott
patent: 3781524 (1973-12-01), Levin
patent: 3794809 (1974-02-01), Beck et al.
patent: 3876862 (1975-04-01), Newman et al.
patent: 3892947 (1975-07-01), Strengholt
patent: 4100398 (1978-07-01), Levin

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