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. 07, 2011
Filed:
Mar. 13, 2007
Applicants:
Kazutaka Hayashi, Yokohama, JP;
Yasuhiro Fujiwara, Akishima, JP;
Inventors:
Kazutaka Hayashi, Yokohama, JP;
Yasuhiro Fujiwara, Akishima, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/155 (2006.01); C03C 3/15 (2006.01); C03C 3/066 (2006.01);
U.S. Cl.
CPC ...
Abstract
A high-refractivity optical glass which has both a low-temperature softening property suitable for precision press-molding and glass stability suitable for hot-shaping of a preform, which contains, by mass %, 13 to 30% of BO, 0.1 to 4% of LiO, 17 to 35% of ZnO, 15 to 45% of LaO, 4 to 15% of TaOexclusive of 15%, 0 to 10% of ZrO, 0 to 10% of NbOprovided that TaO/(TaO+ZrO+NbO)>0.3, 0 to 20% of WOand 0 to 1% of SbOand which has a refractive index (n) of 1.80 to 1.84 and an Abbe's number (ν) of 40.0 to 45.0.