The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1999
Filed:
Oct. 09, 1997
H Winston Maue, Farmington Hills, MI (US);
UT Automotive Dearborn, Inc., Dearborn, MI (US);
Abstract
An apparatus and method for monitoring current flow through a resistive heating element and for detecting breakage of the heating element. In one preferred embodiment the heating element is disposed on a vehicle window. A current is passed through the heating element continuously, even when the vehicle ignition is turned off. A differential amplifier is used to generate a signal representative of the current flow through the heating element which is indicative of whether the heating element is functioning properly or has been broken. The signal is converted from an analog to a digital signal by an analog to digital convertor and then subsequently output to a controller or computer. From this signal the computer determines if the heating element has been broken. The apparatus and method can be used for a variety of functions, but has particular utility in detecting if a window supporting the heating element has been broken such as during an attempted theft.