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:
Nov. 10, 2009
Filed:
Jul. 10, 2006
Michio Endo, Utsunomiya, JP;
Michio Endo, Utsunomiya, JP;
Hoya Corporation, Tokyo, JP;
Abstract
An optical glass having a remarkably high refractive index and excellent stability can be give without being based on PbO, and the optical glass contains, as essential components, at least one oxide selected from LaO, GdO, YO, YbO, TiO, NbOor WO, at least one oxide selected from MgO, CaO, SrO or BaO and BOand optionally containing SiO, wherein on the basis of mass, the total content of BOand SiOis from 1 to 25%, the ratio of (BO+SiO)/(LaO+GdO+YO+YbO+TiO+NbO+WO) is from 0.05 to 0.3 and the ratio of (MgO+CaO+SrO+BaO)/(LaO+GdO+YO+YbO+TiO+NbO+WO) is from 0.1 to 0.4, the optical glass having a refractive index (nd) of 2.000 or more and an Abbe's number (vd) of 27 or less.