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:
Apr. 07, 2020
Filed:
Jun. 10, 2015
Nippon Electric Glass Co., Ltd., Otsu-shi, Shiga, JP;
The University of Tokyo, Bunkyo-ku, Tokyo, JP;
Fumio Sato, Otsu, JP;
Tomoko Yamada, Otsu, JP;
Hiroyuki Inoue, Bunkyo-ku, JP;
Atsunobu Masuno, Bunkyo-ku, JP;
NIPPON ELECTRIC GLASS CO., LTD., Shiga, JP;
THE UNIVERSITY OF TOKYO, Tokyo, JP;
Abstract
Provided is a method that enables a crystal-free glass material to be stably produced by a containerless levitation technique. A glass materialhas a first surfacefacing a forming surfaceand a second surfacelocated on a side opposite to the forming surface. The first surfaceincludes a central portionand a peripheral portionlocated outside of the central portion. Gas is jetted through a gas jet hole at a flow velocity and a flow volume at which a glass material satisfying R<R<Ris formed where Rrepresents a radius of curvature of the central portion, Rrepresents a radius of curvature of the peripheral portion, and Rrepresents a radius of curvature of the second surface