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:
Sep. 24, 2019
Filed:
May. 20, 2011
Matthew J. Dejneka, Corning, NY (US);
Benjamin Z. Hanson, Big Flats, NY (US);
Thomas D. Ketcham, Horseheads, NY (US);
Matthew J. Dejneka, Corning, NY (US);
Benjamin Z. Hanson, Big Flats, NY (US);
Thomas D. Ketcham, Horseheads, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
Isopipes () for making glass sheets using a fusion process are provided. The isopipes are made from alumina materials which have low levels of the elements of group IVB of the periodic chart, i.e., Ti, Zr, and Hf, as well as low levels of Sn. In this way, the alumina isopipes can be used with glasses that contain tin (e.g., as a fining agent or as the result of the use of tin electrodes for electrical heating of molten glass) without generating unacceptable levels of tin-containing defects in the glass sheets, specifically, at the sheets' fusion lines. The alumina isopipes disclosed herein are especially beneficial when used with tin-containing glasses that exhibit low tin solubility, e.g., glasses that have (RO+RO)/AlOratios between 0.9 and 1.1, where, in mole percent on an oxide basis, (RO+RO) is the sum of the concentrations of the glass' alkaline earth and alkali metal oxides and AlOis the glass' alumina concentration.