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:
Jul. 16, 1985
Filed:
Aug. 22, 1983
Walter L Cherry, Winnetka, IL (US);
Cherry Electrical Products Corporation, Waukegan, IL (US);
Abstract
A capacitive or a membrane switch is provided with a coil spring which has a conical base and a top cylindrical portion. The spring biases a switch key to its rest position. When the key is pressed, the conical base is compressed to provide an exponentially increasing counter-force and to actuate the switch at a predetermined actuation point. After the switch is actuated, the key continues to move and compresses the cylindrical portion of the spring to provide a linearly increasing counter-force which indicates overtravel operation of the switch.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile