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:
Jul. 22, 1986
Filed:
Nov. 22, 1985
Applicant:
Inventors:
Minato Ando, Aichi, JP;
Masaaki Ito, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501153 ;
Abstract
An alumina porcelain composition is described, consisting essentially of from 99.4 to 99.9% by weight Al.sub.2 O.sub.3 and a remainder consisting of SiO.sub.2, CaO, and MgO within a compositional range defined by the straight lines connecting the following points A, B, and C in the weight basis ternary composition diagram set forth in the attached drawing: