Title: Device for generating a signal for a predetermined interval after a power switch is opened

Abstract: For the purpose of assuring the holding latching relay in a nonconductive situation whenever an operator turns off a power switch, this invention provides a circuit for generating a signal for a predetermined time interval after the power switch is opened. The circuit includes a power switch, a capacitor charge only when the power switch is closed, a transistor and means for applying a terminal voltage of the capacitor to the transistor in order to render it conductive when the power switch is opened. A rectifier may be provided to prevent a reverse current and the capacitor maybe charged through the rectifier.

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Inventors: Maida, Osamu (Tokyo, JA)

Application Number: 463246
Filing Date: 1974-04-23
Publication_date: 1976-01-20
Assignee: Nippon Kogaku K.K. (Tokyo, JA)
Primary Class(es): 361/196
Other Classes:
US Patent Ref:

3144568	Aug, 1964	Silliman et al.	317/141.
3205411	Sep, 1965	Culbertson	317/141.
3282631	Nov, 1966	Mosinski	317/141.
3683301	Aug, 1972	Boley et al.	317/141.
3732468	May, 1973	Witt et al.	317/141.

Other Refs:
Primary Examiner: Miller, J. D.
Assistant Examiner: Moose, Jr., Harry E.
Attorney: Fitzpatrick, Cella, Harper & Scinto