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:
Dec. 27, 1988
Filed:
Feb. 13, 1987
Applicant:
Inventors:
Akio Makishima, Sakura, JP;
Mitsuaki Asami, Sakura, JP;
Assignee:
National Institute for Research in Inorganic Materials, Ibaraki, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
501-5 ; 65 17 ; 65 33 ; 501 10 ;
Abstract
A process for producing a machinable crystallized glass having needle-like crystals precipitated therein, which comprises melting a mixture comprising from 40 to 60 mol % of SiO.sub.2, from 6 to 16 mol % of Al.sub.2 O.sub.3, from 6 to 16 mol % of Y.sub.2 O.sub.3 and from 15 to 30 mol % of CaO, and allowing the melt to cool to have fine needle-like crystals of Ca.sub.4 Y.sub.6 O(SiO.sub.4).sub.6 precipitated.