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:
Sep. 07, 1982
Filed:
Oct. 01, 1980
Ronald F Hormel, Mt. Clemens, MI (US);
Frederick O Miesterfeld, Troy, MI (US);
Chrysler Corporation, Highland Park, MI (US);
Abstract
A lamp failure indicating circuit particularly useful for automotive vehicle application such as detecting failure of headlamps, stop lamps and/or turn signal lamps. The disclosed circuit embodiments monitor branch circuits each containing a lamp load and comprising an associated transformer. Each transformer comprises two coils disposed on a ferromagnetic torroidal core. One coil of each transformer is connected in the branch circuit of the associated lamp load, the coil and lamp load being in series, and being associated with a means which forms therewith a complete circuit path which is independent of the power supply which energizes the lamp load. The other coils of the transformers are connected in a circuit to which a test signal is applied with the result of the test indicating whether any of the lamps are failed.