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. 16, 2014
Filed:
Sep. 12, 2011
Takahiro Matano, Otsu, JP;
Fumio Sato, Otsu, JP;
Takahiro Matano, Otsu, JP;
Fumio Sato, Otsu, JP;
Nippon Electric Glass Co., Ltd., Shiga, JP;
Abstract
Provided is an optical glass which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having a superior visible light transmittance; and (5) it has superior resistance to devitrification during preparation of a preform. The optical glass has a refractive index nd of 2.0 or more, an Abbe's number νd of 20 or less, a glass transition point of 450° C. or below, and a glass composition, in % by mass, of 70 to 90% BiO, 4 to 29.9% BO, 0.1 to 10% LiO+NaO+KO, and 0 to 2.5% SiO+AlOand is substantially free of lead component, arsenic component, F component, TeO, and GeO.