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:
Feb. 02, 2010
Filed:
Aug. 30, 2006
Kazutaka Hayashi, Yokohama, JP;
Kazutaka Hayashi, Yokohama, JP;
Hoya Corporation, Tokyo, JP;
Abstract
Provided is a precision press-molding optical glass that is not easily degraded in quality by the occurrence of an altered layer such as fogging or yellowing on a surface and that comprises BO, ZnO, LaOand ZrOand contains, by mol %, 0 to less than 0.5% of LiO, 20 to 50% of BO, 0 to 20% of SiO, 22 to 42% of ZnO, 5 to 24% of LaO, 0 to 20% of GdO, provided that the total content of LaOand GdOis 10 to 24%, 0.5 to 10% of ZrO, 0 to 15% of TaO, 0 to 20% of WO, 0 to 15% of NbO, 0 to 20% of TiO, 0 to 10% of BiO, 0 to 10% of GeO, 0 to 10% of GaO, 0 to 10% of AlO, 0 to 10% of BaO, 0 to 10% of YOand 0 to 10% of YbO, the optical glass having an Abbe's number (νd) of at least 35 but less than 40.