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:
Aug. 22, 1989
Filed:
Mar. 31, 1988
Applicant:
Inventors:
Casimer Gotfryd, Wauconda, IL (US);
Stephen L Kay, Palatine, IL (US);
Hartland P Klotz, Highland Park, IL (US);
Robert M Wentzel, Mundelein, IL (US);
Assignees:
Other;
AT&T Information Systems Inc., Morristown, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
200408 ; 200341 ; 200457 ; 200517 ; 200521 ;
Abstract
A key switch utilizing a buckling compression spring to move a switch actuator mechanism includes a cylindrical core of resilient material located within an opening formed by the coils of the compression spring to attenuate the acoustical energy generated by the buckling and unbuckling action of the spring.