Window cleaning fluid heating system having timer-controlled hea

Details Window cleaning fluid heating system having timer-controlled hea Window cleaning fluid heating system having timer-controlled hea

1992-03-16

1994-10-11

Bartis, Anthony

Electric heating

Heating devices

Combined with diverse-type art device

1525005, 219492, 219505, 219530, 219540, 2221465, 2392841, 2392842, 392441, 392458, 392480, 392484, H05B 102, F24H 110, B60S 146, B67D 562

Patent

active

053549651

ABSTRACT:
A system for electrically heating a volume of windshield cleaning fluid in a motor vehicle includes a metallic vessel connected between a windshield fluid reservoir and a nozzle for spraying the windshield with the fluid. The vessel has a metal heater wall heated by PTC thermistors thereon and provided with a plurality of metal heat exchange pins extending into an internal chamber in the vessel through which the fluid flows to be heated. A control circuit is provided and includes an electronic timer circuit for controlling the length of time the thermistors are energized to heat the fluid in accordance with the prevailing ambient temperature, an engine speed sensor including a pulse stretching circuit for preventing energization of the thermistors if the engine of the vehicle is not running, and a differential input circuit for simplifying the attachment of the system to a standard windshield cleaning fluid pump.

REFERENCES:
patent: 3023299 (1962-02-01), Mills
patent: 3309503 (1967-03-01), Dow et al.
patent: 3423569 (1969-01-01), Cappell et al.
patent: 4090668 (1978-05-01), Kochenour
patent: 4177375 (1979-12-01), Meixner
patent: 4242999 (1981-01-01), Hoser
patent: 4395993 (1983-08-01), Tanaka et al.
patent: 4508957 (1985-04-01), Rocchitelli
patent: 4555743 (1985-11-01), Kokubu et al.
patent: 4768716 (1988-09-01), Buchanan et al.
patent: 4894520 (1990-01-01), Moran

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