Crack detector for electrically conductive windshield

Details Crack detector for electrically conductive windshield Crack detector for electrically conductive windshield

1988-01-11

1990-09-18

Reynolds, B. A.

Electric heating

Heating devices

With current connection and/or disconnection means

219203, 219522, H05B 102, B60L 102

Patent

active

RE0333433

ABSTRACT:
A circuit and method for interrupting power applied to an electrically conductive panel such as a vehicle windshield or window upon cracking of the conductive coating or element thereon. The circuit includes structure for (1) monitoring the resistance of the conductive element and (2) interrupting power applied thereto when the resistance of the conductive element assumes a value indicative of element cracking.

REFERENCES:
patent: 2530980 (1950-11-01), Mershon
patent: 3441925 (1969-04-01), White
patent: 3524920 (1970-08-01), Stromquist et al.
patent: 3760157 (1973-09-01), Newman et al.
patent: 3790745 (1974-02-01), Levin
patent: 3876862 (1975-04-01), Newman et al.
patent: 3892947 (1975-07-01), Strengholt
patent: 3905015 (1975-09-01), Inose et al.
patent: 3941975 (1976-03-01), Newman et al.
patent: 3982092 (1976-09-01), Marriott
patent: 4109196 (1978-08-01), Carmody
patent: 4127765 (1978-11-01), Heaney
patent: 4135078 (1979-01-01), Kuiff et al.
patent: 4260876 (1981-04-01), Hochheiser
Brochure entitled, "Stratobel Alarm a.c.c.", by Glaverbel of Brussels, Belgium, 1982.

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