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:
Mar. 11, 2008
Filed:
Sep. 07, 2004
Takaharu Hosokawa, Osaka, JP;
Naoki Kikuchi, Osaka, JP;
Tatsuya Suetsugu, Osaka, JP;
Kazuhisa Kimura, Osaka, JP;
Tadashi Hasegawa, Osaka, JP;
Toshihiko Einishi, Osaka, JP;
Takashi Tarumi, Osaka, JP;
Kohei Kadono, Ikeda, JP;
Takaharu Hosokawa, Osaka, JP;
Naoki Kikuchi, Osaka, JP;
Tatsuya Suetsugu, Osaka, JP;
Kazuhisa Kimura, Osaka, JP;
Tadashi Hasegawa, Osaka, JP;
Toshihiko Einishi, Osaka, JP;
Takashi Tarumi, Osaka, JP;
Kohei Kadono, Ikeda, JP;
Isuzu Glass Co., Ltd., Osaka-shi, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Abstract
The present invention provides a novel glass material that allows the production of a glass product having both excellent chemical durability and high precision by a press molding method. Specifically, the present invention provides a glass for press molding, comprising 38% to 45% by weight of SiO, 18% to 27% by weight of BO, 16% to 25% by weight of AlO, 2% to 12% by weight of ZnO, no more than 3% by weight of MgO, no more than 3% by weight of CaO, no more than 3% by weight of BaO, 13% to 18% by weight of LiO, no more than 3% by weight of KO, and no more than 2% by weight of NaO; wherein the glass has a deformation temperature of 520° C. or lower; and the glass has a water resistance of grade 2 or higher as measured according to the Japanese Optical Glass Industrial Standard method for measuring the chemical durability of an optical glass.