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. 16, 1981
Filed:
Aug. 08, 1979
Applicant:
Inventors:
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
106 734 ; 264 65 ; 264 66 ; 425600 ;
Abstract
Polycrystalline spinel sintered body consisting mainly of Al.sub.2 O.sub.3 and MgO in a molar ratio of Al.sub.2 O.sub.3 /MgO of ranging from 0.52/0.48 to 0.70/0.30 and containing 0.001-0.1% by weight of LiF has a high in-line transmission. The sintered body can be obtained by calcining a powdery mixture of Al.sub.2 O.sub.3 and MgO in a specifically limited molar ratio, molding the calcined mixture into a shaped article together with a specifically limited amount of LiF, and firing the shaped article under a specifically limited temperature condition.