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:
Jun. 26, 2001
Filed:
Apr. 27, 1999
Kouichi Sato, Tokyo, JP;
Hoya Corporation, Tokyo, JP;
Abstract
An optical glass having properties of a high refractive index and low dispersion and having both a low sag temperature T,and a low liquidus temperature L.T., is provided. The optical glass comprises, by % by weight, 25 to 42% of B,O,, 14 to 30% of La,O,, 2 to 13% of Y,O,, 2 to 20 of SiO,, greater than 2% and 9% or less of Li,O, 0.5 to 20% of CaO, 2 to 20% of ZnO, 0 to 8% of Gd,O,, 0 to 8% of ZrO,, Gd,O,+ZrO,being 0.5 to 12%, the total content thereof being at least 90%, and optionally contains 0 to 5% of Na,O, 0 to 5% of K,O, 0 to 5% of MgO, 0 to 5% of SrO, 0 to 10% of SrO, 0 to 10% of BaO, 0 to 5% of Ta,O, 0 to 5% of Al,O,, 0 to 5% of Yb,O,, 0 to 5% of Nb,O,, 0 to 2% of As,O,and 0 to 2% of Sb,O,.