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:
Oct. 23, 1984
Filed:
May. 26, 1982
Hitomi Aizawa, Suwa, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
A chattering preventive circuit for preventing chattering in a switch having a mechanical contact. The circuit includes a switch element for producing an input signal representative of the open and closed states of the switch and also includes a periodic pulse signal. A first memory circuit receives the input signal and the periodic pulse signal and produces a write-in signal representative of the coincidence of the input signal and the periodic pulse signal. A second memory circuit receives the write-in signal and the periodic pulse signal and produces an output signal representative of the closed state of the switch element only when the switch element is kept closed for at least a predetermined time period. The second memory circuit will not produce the next output signal representative of another closing of the switch element unless the switch element first remains open for at least a predetermined time prior to reclosing.