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:
May. 08, 1984
Filed:
Dec. 14, 1981
Manfred Gundel, Wuppertal, DE;
Heinz-Werner Schlamm, Wuppertal, DE;
Klaus-Dieter Schmitz, Wuppertal, DE;
Kabelwerke Reinshagen GmbH, , DE;
Abstract
A test circuit is disclosed for testing the continuity of a load circuit, such as a vehicle lamp circuit, and indicating a discontinuity when the load circuit is either energized or de-energized. The test circuit comprises an indicating circuit with an LED and a switching transistor in series and a voltage divider for biasing the transistor to a conductive state. The detecting circuit includes a reed switch which is closed in response to load current for connecting a point on the voltage divider to ground to switch the transistor off. The detecting circuit also includes current blocking means such as a diode for connecting the voltage divider to ground through the load circuit so that the transistor is switched off when there is continuity in the load circuit to ground.