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. 15, 1981
Filed:
Jul. 07, 1980
Applicant:
Inventor:
Toshiharu Yamashita, Hachioji, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
501 78 ; 2523 / ; 501 79 ; 501905 ;
Abstract
A glass for use as an optical glass having an anti-blurring property, water resistance and hardness and decreased liquidus temperature, said glass consisting essentially of, in mol. %, 47 to 65% P.sub.2 O.sub.5, 0.5 to 12% SiO.sub.2, 0.5 to 10% B.sub.2 O.sub.3, 6 to 15% SiO.sub.2 +B.sub.2 O.sub.3, 0 to 30% alkali metal oxide, 5 to 35% alkaline earth metal oxide, 20 to 45% alkali metal oxide+alkaline earth metal oxide, 0 to 5% Al.sub.2 O.sub.3, 0 to 10% ZnO, and no PbO. Oxides of Ce, Nd and Er may also be present.