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. 21, 2009
Filed:
Apr. 26, 2006
Tomoyuki Kobayashi, Kitakyushu, JP;
Jun Sasai, Yokohama, JP;
Syuji Matsumoto, Yokohama, JP;
Naoki Sugimoto, Yokohama, JP;
Tomoyuki Kobayashi, Kitakyushu, JP;
Jun Sasai, Yokohama, JP;
Syuji Matsumoto, Yokohama, JP;
Naoki Sugimoto, Yokohama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
An optical glass which has an internal transmittance to a light having a wavelength of 400 nm being at least 90% as calculated in a thickness of 1 mm and which contains at least 25 mol % of BOand from 0.1 to 20 mol % of TeO. The above optical glass which contains LaO. The above optical glass wherein the glass transition point ≦650° C. and the refractive index at 633 nm≧1.70. A process for producing an optical element made of the above optical glass, which comprises dropping the optical glass in a molten state from a flow outlet of a flow out pipe made of a platinum alloy to form a preform and subjecting it to precision press-molding.