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:
Oct. 29, 1985
Filed:
Apr. 05, 1984
Robert E Steele, Cortland, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A lamp monitor for detecting the failure of headlamps and other lamps on an automotive vehicle includes a failure detection circuit coupled to the lamp circuit to produce an output whenever the lamp circuit is operating and a failure occurs. A latch circuit responsive to the detector output and powered from the vehicle battery latches into a failure state when a lamp failure is detected and maintains that state even though the lamp circuit or the vehicle ignition circuit is switched off. The latch output triggers an indicator circuit to reveal an indication or warning when the vehicle ignition switch is turned on even though the lamp circuit is turned off and the ignition switch has been opened subsequent to the detected failure. Upon correction of the failure, the detector resets the latch circuit when the lamp circuit is actuated to disable the display.