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:
Jul. 11, 1989
Filed:
May. 11, 1987
Applicant:
Inventor:
Jean Youla, Brooklyn, NY (US);
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
361159 ; 34081503 ; 340645 ;
Abstract
A driver circuit for the coil in relay contains a suppressor diode across the coil terminals. Two light-emitting diodes are connected in reverse polarity so that one diode operates when the coil is energized and the other diode operates if there is current flowing in the reverse direction when the suppressor diode fails to clamp the coil voltage. The diodes may be of different colors and may be positioned close to each other to produce the composite color when they are energized at the same time or in rapid succession.