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. 23, 2013
Filed:
Sep. 24, 2009
Kiyoshi Yamamoto, Yokohama, JP;
Michio Endo, Utsunomiya, JP;
Kiyoshi Yamamoto, Yokohama, JP;
Michio Endo, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is an optical glass having homogeneous optical characteristics such that striae and devitrification hardly occur at the time of producing a gob. The optical glass includes cationic components having the following composition, provided that a total of the cationic components is 95 cat %, and has a refractive index (nd) of 1.6 or more and less than 1.7 and an Abbe number (vd) of 50 or more and 56 or less, Si3 cat % or more and 13 cat % or less B40 cat % or more and 55 cat % or less La4 cat % or more and 9 cat % or less Ca6 cat % or more and 12 cat % or less Li11 cat % or more and 18 cat % or less Zn6 cat % or more and 12 cat % or less Zr1 cat % or more and 4 cat % or less provided that Si/Bis 0.05 or more and 0.3 or less, and Li/Znis 1.3 or more and 2.0 or less.