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. 08, 2014
Filed:
Sep. 27, 2012
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Isao Saito, Chiyoda-ku, JP;
Junji Hori, Chiyoda-ku, JP;
Kiyota Miyazaki, Chiyoda-ku, JP;
Tomohiro Suwa, Chiyoda-ku, JP;
Yasumasa Kato, Chiyoda-ku, JP;
Satoshi Yoshida, Chiyoda-ku, JP;
Kazushige Yoda, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Abstract
The method for tempering a glass sheet of the present invention comprises a heating step of heating the glass sheet to a temperature close to the softening point of the glass sheet, a quenching step of blowing a cooling medium to both surfaces in the thickness direction of the heated glass to cool it, and a pre-quenching step between the heating step and the quenching step and further has an internal heating substep of selectively heating the vicinity of the center portion in the thickness direction of the glass sheet at least in the quenching step, to create such a state that when the temperature at the center portion in the thickness direction of the glass sheet is close to the tempering point, the temperature at the surfaces in the thickness direction of the glass sheet is not higher than the annealing point.