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:
Jul. 23, 2013
Filed:
Jan. 26, 2012
Applicants:
Tomoaki Negishi, Tokyo, JP;
Xuelu Zou, Tokyo, JP;
Inventors:
Tomoaki Negishi, Tokyo, JP;
Xuelu Zou, Tokyo, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/066 (2006.01); C03C 3/068 (2006.01);
U.S. Cl.
CPC ...
Abstract
A high-refractivity low-dispersion optical glass that can be stably supplied and has excellent glass stability and that has coloring reduced, composed of in mass %, 5 to 32% of total of SiOand BO, 45 to 65% of total of LaO, GdOand YO, 0.5 to 10% of ZnO, 1 to 20% of total of TiOand NbO, and optionally other components. The optical glass has a refractive index nd of 1.89 to 2.0, an Abbe's number νd of 32 to 38 and a coloring degree λ70 of 430 nm or less.