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:
Jun. 15, 2004
Filed:
Oct. 18, 2001
Tsuneaki Ohashi, Ogaki, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A corrosion-resistive member is provided, including a corrosion-resistive face that is exposed to a corrosive gas causing ion bombardmemt. At least a part of the corrosion-resistive member is composed of a sintered silicon nitride body having an open porosity of not more than 5%. The sintered silicon nitride body constitutes the corrosion-resistive face, and if two auxiliary planes are formed by cutting the corrosion-resistive member to intersect vertically with the corrosion-resistive face and to be located vertically with respect to each other, the orientation index between the two auxiliary planes is in a range of 0.8 to 1.2, and the orientation index between the corrosion-resistive face and each of the auxiliary faces is at least 1.5.