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:
Jul. 19, 2016
Filed:
Mar. 15, 2013
Tomoaki Negishi, Tokyo, JP;
Tomoaki Negishi, Tokyo, JP;
HOYA CORPORATION, Tokyo, JP;
Abstract
An optical glass is oxide glass wherein Si+Branges from 10-60 cation %, La+Gd+Y+Ybranges from 25-70 cation %, Ti+Nb+W+Biranges from 10-20 cation %, Licontent ranges from 0-5.0 cation %, Ge content is lower than 5.0 mass % as quantity of GeObased on oxides, no Pb included, a cation ratio, Si/B, is equal or lower than 0.70, a cation ratio, (La+Gd+Y+Yb)/(Ti+Nb+W+Bi), ranges from 1.90-7.00, a cation ratio, Y/(La+Gd+Y+Yb), is equal or lower than 0.180, and Nbis an essential component, with Ti/Nbbeing equal or lower than 4.00, with nd of higher than 1.920 and equal or lower than 2.000, vd ranging from 28.0-34.0, and yield point higher than 645° C., and a deviation ΔPg,F from normal line of partial dispersion ratio Pg,F being equal or lower than 0.0005.