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. 25, 1998
Filed:
Oct. 25, 1996
Yukihisa Takeuchi, Aichi-ken, JP;
Tsutomu Nanataki, Toyoake, JP;
Hideo Masumori, Anjo, JP;
Katsuyuki Takeuchi, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
A method of producing a ceramic diaphragm structure, including a ceramic substrate having at least one window, and a ceramic diaphragm plate superposed on the ceramic substrate to close the window or windows. The method includes the steps of: firing the diaphragm plate with the ceramic substrate to form an integral sintered body, such that the diaphragm plate provides at least one diaphragm portion aligned with the window or windows; protruding each diaphragm portion outwards, in a direction away from the corresponding window, so that the diaphragm portion is formed into a convex shape; and controlling the amount of protrusion of the diaphragm portion, by pressing a jig having a flat surface or a concave surface, against a top part of the diaphragm portion having the convex shape, so that at least the top part has a flat surface or a curved surface having a predetermined radius of curvature.