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:
Sep. 01, 2009
Filed:
Apr. 28, 2008
Hiroyuki Ohkawa, Tokyo, JP;
Naoki Sugimoto, Tokyo, JP;
Hiroyuki Ohkawa, Tokyo, JP;
Naoki Sugimoto, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
The object of the present invention is to provide an optical glass which has optical constants such as a refractive index of from 1.45 to 1.65 and an Abbe number of at least 65 and which is yet excellent in chemical durability. A phosphate optical glass comprising, as glass components by mass %, from 73 to 85 of PO, from 14 to 26 of AlO, from 1 to 12 of KO+LiO, from 0 to 12 of SiO, from 0 to 12 of BO, from 0 to 12 of NaO, from 0 to 12 of YO, from 0 to 12 of LaO, from 0 to 12 of MgO+CaO+SrO+BaO, from 0 to 10 of ZrO+TiO+GdO, from 0 to 10 of TaO+GeO+GaO+NbO+WO+TeO, from 0 to 2 of SbO, and from 0 to 12 of ZnO+PbO.