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. 02, 2022
Filed:
Jul. 19, 2018
Eurokera, Jouarre, FR;
Philippe Lehuede, Dammarie-les-Lys, FR;
Marie Comte, Fontenay aux Roses, FR;
Eurokera, Jouarre, FR;
Abstract
The present application relates to glass-ceramics that are white, opalescent or opaque, of the lithium aluminosilicate (LAS) type, containing a solid solution of β-spodumene as the main crystalline phase. The application also provides articles that are constituted, at least in part, of said glass-ceramics, precursor glasses for said glass-ceramics, and a method of preparing said article. Said glass-ceramics have a composition that is free from arsenic oxide and antimony oxide, with the exception of inevitable traces, and that contains the following, expressed as percentages by weight of oxides: 60% to 70% of SiO, 18% to 23% of AlO, 3.0% to 4.3% of LiO, 0 to 2% of MgO, 1 to 4% of ZnO, 0 to 4% of BaO, 0 to 4% of SrO, 0 to 2% of CaO, 1.3% to 1.75% of TiO, 1% to 2% of ZrO, 0.05% to 0.6% of SnO, 0 to 2% of NaO, 0 to 2% of KO, 0 to 2% of PO, 0 to 2% of BO, with NaO+KO+BaO+SrO+CaO≤6% and NaO+KO≤2%, and a maximum of 500 ppm of FeO.