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:
Apr. 01, 2008
Filed:
Jan. 21, 2005
Yoshiko Kasuga, Koganei, JP;
Xuelu Zou, Akishima, JP;
Yoshiko Kasuga, Koganei, JP;
Xuelu Zou, Akishima, JP;
Hoya Corporation, Tokyo, JP;
Abstract
An optical glass taking account of meltability and the moldability of a preform, having optical constants including a refractive index (nd) of at least 1.57 but less than 1.67 and an Abbe's number (νd) of over 55 but not more than 65, having the property of softening at a low temperature and being suitable as a glass for precision press-molding, the optical glass including an optical glass containing BO, SiO, LaO, GdO, an alkali metal oxide and an alkaline earth metal oxide as essential components, having a BOand SiOtotal content of 52% by weight or more and having an SiO/BOcontent ratio of from 0.38 to 1.2, and an optical glass wherein the relationship of the refractive index (nd) and the Abbe's number (νd) satisfies the equation (1),ν>260−126×.   (1)