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:
Apr. 19, 1983
Filed:
May. 22, 1981
Applicant:
Inventor:
Roger L Miller, Ann Arbor, MI (US);
Assignee:
Kelsey-Hayes Co., Romulus, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; B60Q / ;
U.S. Cl.
CPC ...
315 93 ; 307 / ; 315135 ; 315 77 ; 340642 ;
Abstract
An improved dual polarity substitution circuit for energizing a secondary load, such as an incandescent lamp, upon failure of a primary load. Dual polarity is achieved through the use of parallel PNP and NPN transistors, one of which conducts so long as the primary load is functional. Upon failure of the primary load and interruption of current flow in the conducting one of the transistors, a bidirectional switch such as a triac is fired to energize the secondary load.
Miller, Roger. (1983). Trailer marker light substitution circuit (U.S. Patent No. 4380718). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4380718
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile