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:
Sep. 01, 1998
Filed:
Feb. 20, 1997
Craig A Willkens, Worcester, MA (US);
Linda S Bateman, Spencer, MA (US);
Saint-Gobain/Norton Industrial Ceramics Corporation, Worcester, MA (US);
Abstract
A ceramic igniter comprises a pair of conductive ends, a hot zone disposed between the conductive ends, the hot zone having a density of at least about 95% of theoretical density and a composition comprising: (a) between about 50 and about 80 vol % of an electrically insulating material selected from the group consisting of aluminum nitride, boron nitride, silicon nitride, and mixtures thereof. (b) between about 10 and about 45 vol % of a semiconductive material selected from the group consisting of silicon carbide and boron carbide, and (c) between about 5 and about 25 vol % of a metallic conductor selected from the group consisting of molybdenum disilicide, tungsten disilicide, titanium nitride, and mixtures thereof, and a support upon which the hot zone is disposed, wherein at least a portion of the hot zone has a thickness of no more than 0.019'.