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. 24, 1991
Filed:
May. 11, 1989
Applicant:
Inventor:
Ricky A Hurley, Fletcher, NC (US);
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
307115 ; 3071 / ; 361 54 ; 361189 ;
Abstract
A mechanically normally open low voltage switch is connected between ground and the high impedance input of a low voltage electronic circuit fed by a low voltage source through a low impedance resistor. With the switch open, current flows into high impedance input of the electronic circuit to provide the electrically normally closed function. When the switch is actuated to the closed position, the high impedance input is pulled down to ground to provide the switch open function.