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:
Dec. 07, 1976
Filed:
Apr. 18, 1975
Pak-Jong Chu, Ottawa, CA;
Cornelis Wilfred Reedyk, Ottawa, CA;
Northern Electric Company Limited, Montreal, CA;
Abstract
A push-button switch has a spring contact plate and a circuit board in superposed position. The spring contact plate has one or more switch positions, each switch position comprising a prestressed domed portion surrounded by a common flat sheet portion. The spring contacts of each prestressed dome portion selectively engage peripheral contact areas on the circuit board followed by the central contact portion engaging subsequently with a further fixed central contact area on the circuit board. Accordingly, plural inputs of electronic logic circuits may be preselected prior to simultaneous activation upon subsequent closure of the central contacts at a given switch position. Release of the push button enables the domed portion to snap back to the stable position.