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:
Nov. 22, 1983
Filed:
Jun. 25, 1981
Applicant:
Inventor:
Hitomi Aizawa, Suwa, JP;
Assignee:
Kabushiki Kaisha Suwa Seikosha, Chuo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
3072 / ; 307246 ;
Abstract
A signal produced by connecting the electrical contacts of a mechanical switch is read into a circuit without chatter only when the switch is closed longer than a selected time period. A first memory stores and outputs a switch actuation signal on the occurrence of a read signal, and erases the stored signal when the switch actuation signal is removed. A second memory outputs a square wave pulse on the coincidence of a later read signal and the first memory output. Electrical noise lasting less than the selected time period does not produce an output. The selected time period can be varied by using independent, phase-shifted read signals for each memory.