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:
Mar. 09, 1999
Filed:
Jul. 25, 1997
Nihon Densi Kougaku Corporation, Tochigi, JP;
Nippon Aleph Corporation, Kanagawa, JP;
Abstract
A vibration sensing element includes a hermetically sealed case, a fixed electrode member made of a nonmagnetic electrically conductive material and fixed to the case with its tip portion projecting into the case, a movable electrode member made of an electrically conductive magnetic metal material exhibiting elasticity and fixed to the case with its tip portion projecting into the case and making pressure contact with the fixed electrode member, and a magnetic member disposed to face the movable electrode member. A glass breakage sensor includes a casing for attachment to the glass, the vibration sensing element, and a resin molding encasing the vibration sensing element. The contact pressure between the fixed and movable electrode members can be noninvasively checked by applying a magnetic field thereto.