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:
Aug. 14, 2012
Filed:
Sep. 30, 2009
Masahiro Tomamoto, Otsu, JP;
Michiharu Eta, Otsu, JP;
Hidetaka Oda, Otsu, JP;
Tatsuya Takaya, Otsu, JP;
Yasuo Yamazaki, Otsu, JP;
Hiroshi Takimoto, Otsu, JP;
Shinichi Ishibashi, Otsu, JP;
Keiji Takagi, Otsu, JP;
Daisuke Nagata, Otsu, JP;
Takahide Nakamura, Otsu, JP;
Toru Sakurabayashi, Otsu, JP;
Katsutoshi Fujiwara, Otsu, JP;
Mitsuharu Noda, Otsu, JP;
Yasuhiko Ogiso, Otsu, JP;
Takahide Fujii, Otsu, JP;
Masahiro Tomamoto, Otsu, JP;
Michiharu Eta, Otsu, JP;
Hidetaka Oda, Otsu, JP;
Tatsuya Takaya, Otsu, JP;
Yasuo Yamazaki, Otsu, JP;
Hiroshi Takimoto, Otsu, JP;
Shinichi Ishibashi, Otsu, JP;
Keiji Takagi, Otsu, JP;
Daisuke Nagata, Otsu, JP;
Takahide Nakamura, Otsu, JP;
Toru Sakurabayashi, Otsu, JP;
Katsutoshi Fujiwara, Otsu, JP;
Mitsuharu Noda, Otsu, JP;
Yasuhiko Ogiso, Otsu, JP;
Takahide Fujii, Otsu, JP;
Nippon Electric Glass Co., Ltd., Shiga, JP;
Abstract
Provided is a glass roll formed by winding a glass film into a roll, in which a minimum winding radius of the glass film is optimized. Thus, the glass film is reliably prevented from breaking due to static fatigue, and is able to be stored for long periods. A glass roll (), which is formed by winding a glass film () into a roll, has a configuration in which the glass film has a minimum winding radius (R) satisfying the following relation: R≧(T/2)[(2.3/σ)×E−1], where σ represents flexural strength of the glass film () obtained by a 3-point bending test, T represents a thickness of the glass film, and E represents a Young's modulus of the glass film.