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. 21, 1993
Filed:
Feb. 26, 1992
Applicant:
Inventors:
Tomoko Kasuga, Akishima, JP;
Toshihiro Kasuga, Nagoya, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
501-3 ; 501-5 ; 501 69 ; 501 70 ; 106 35 ;
Abstract
A glass-ceramic which is excellent in mechanical strength, cutting processability and chemical durability and suitable for the production of an artificial dental crown and a mold, the glass-ceramic containing, by weight percentage, 2 to 17% of CaO, 0 to 5% of K.sub.2 O, 0 to 4% of Na.sub.2 O, the total content of K.sub.2 O and Na.sub.2 O being 0.5-7%, 15 to 35% of MgO, 30 to 49% of SiO.sub.2, 2 to 15% of ZrO.sub.2 and not more than 14% (calculated as F) of fluorine, and having a zirconia crystal and a mica crystal precipitated.