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:
May. 31, 1988
Filed:
Sep. 15, 1986
Applicant:
Inventors:
Yasuharu Hakamatsuka, Hachioji, JP;
Kazuhiro Watanabe, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; C09K / ;
U.S. Cl.
CPC ...
106 35 ; 65 33 ; 433218 ; 4332221 ; 433223 ; 501-3 ; 501-7 ; 501 57 ;
Abstract
A dental crown formed of a dental crown material comprising crystallized glass containing 40 to 45% by weight of SiO.sub.2, 11 to 15% by weight of Al.sub.2 O.sub.3, 16 to 23% by weight of MgO, 6.5 to 8% by weight of F, 4.0 to 7.0% by weight of Na.sub.2 O, 5 to 9% by weight of Li.sub.2 O, not more than 1% by weight of TiO.sub.2, 2 to 4% by weight of ZrO.sub.2, and at least one oxide selected from the group consisting of Fe.sub.2 O.sub.3, MnO, CeO.sub.2 and NiO, and having a bending strength of at least 2000 Kg/cm.sup.2.