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. 25, 1977
Filed:
Dec. 10, 1975
Nippondenso Co., Ltd., Kariya, JA;
Abstract
A current winding is connected between an electric current source and automotive lamps for generating a magnetomotive force in response to the amount of current flowing therethrough. A voltage winding is connected in parallel with the combination of the current winding and the automotive lamps for generating an opposite magnetomotive force to that of the current winding. A reed switch is disposed adjacent the current and the voltage windings and is energized to close or open by the net magnetomotive force of the two windings. An indicating lamp is operatively related to the reed switch so as to be energized when the net magnetomotive force becomes lower than a predetermined value because of the interruption in operation of at least one of the lamps. A zener diode is further connected in series with the voltage winding in order to enable indication of the interruption when all of the automotive lamps are inoperative.