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:
Feb. 14, 1995
Filed:
Dec. 06, 1993
Adrian Madau, Dearborn, MI (US);
Ford Motor Company, , DE (US);
Abstract
An alarm system for detecting glass breakage has a switch having an input terminal, output terminal, and control terminal. The input terminal is electrically connected to a power source such as a battery. An electrically conductive trace is formed on glass, and is electrically connected to the output terminal of the switch. A controller is electrically connected to the control terminal of the switch and controls the operation of the switch between conducting and non-conducting states. The controller measures and compares a reference output terminal voltage of said switching means while said switching means is in the conducting state, a second output terminal voltage while the switch is in the non-conducting state and a third output terminal voltage of the switch while the switching is in the conducting state. The controller generates a control signal in response to a comparison of said measured voltages.