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:
Nov. 21, 2006
Filed:
Dec. 12, 2003
Susumu Uehara, Sagamihara, JP;
Koji Shimizu, Sagamihara, JP;
Shinya Mashiko, Sagamihara, JP;
Kabushiki Kaisha Ohara, Sagamihara, JP;
Abstract
An optical glass having a refractive index (n) and an Abbe number (v) which are within an area surrounded by the straight lines which are drawn by connecting point A (n=1.835, v=46.5), point B (n=1.90, v=40.0), point C, (n=1.90, v=35.0) and point D (n=1.835, v=38.0) in a sequence of A, B, C, D and A as border lines in x-y coordinates shown in FIG., in which X-axis is the Abbe number (v) and Y-axis is the refractive index (n), the area including the border line. The optical glass has low glass transition temperature (Tg), and suitable for precision mold pressing. The optical glass which has the refractive index (n) and Abbe number (v) within the above-described area, where the area includes the border lines, has the composition of SiO—BO—LaO—GdO—LiO—F system, the transition temperature (Tg) of 550 to 650° C., and is free from lead, cadmium, thorium, YO, POand TeO.