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. 02, 2008
Filed:
Jan. 29, 2003
Yoshio Mori, Yokohama, JP;
Masahiro Onozawa, Sagamihara, JP;
Yoshio Mori, Yokohama, JP;
Masahiro Onozawa, Sagamihara, JP;
Kabushiki Kaisha Ohara, Kanagawa-Ken, JP;
Abstract
An optical glass comprising in mass %: The optical glass should preferably contain 0.1-5% WO, 3.6-15% MgO, 0.1-5% LiO+NaO+KO, 0—less than 0.5% and SbO+AsOwith the mass ratio of ZnO/BaO being 0.12—less than 0.50. The optical glass should preferably have refractive index (nd) within a range from 1.54 to 1.65 and Abbe number (νd) within a range exceeding 57 up to 69 and liquid phase temperature within a range from 870° C. to 930° C. There is provided an optical glass having high resistance to devitrification and medium refractive index and low dispersion characteristics which is free of ingredients such as TaOhaving a high cost of raw material and therefore can be manufactured at a relatively low cost of raw materials.