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:
Mar. 30, 2021
Filed:
May. 27, 2016
Eurokera, Jouarre, FR;
Estelle Molieres, Fontainebleau, FR;
Marie Jacqueline Monique Comte, Fontenay aux Roses, FR;
EUROKERA, Jouarre, FR;
Abstract
The object of the present application is β-quartz glass-ceramics (having very interesting optical, thermal expansion and feasibility properties), the articles including said glass-ceramics; the precursor glasses of said glass-ceramics, as well as the methods for elaborating said glass-ceramics and said articles. Said glass-ceramics having a composition, free, except for inevitable trace amounts, of arsenic oxide, antimony oxide and rare earth oxide, which contains, expressed in percentages by weight of oxides: 64 to 70% of SiO, 18 to 24% of AlO, 4 to 5% of LiO, 0 to 0.6% of SnO, >1.9 to 4% of TiO, 1 to 2.5% of ZrO, 0 to 1.5% of MgO, 0 to 3% of ZnO, >0.3 to 1 of CaO, 0 to 3% of BaO, 0 to 3% of SrO, with BaO+SrO≤3%, 0 to 1.5% of NaO, 0 to 2% of KO, with 0.2<(MgO+NaO+KO)/LiO≤1, 0 to 3% of PO, less than 250 ppm of FeO; and their crystallites, present in said β-quartz solid solution, have an average size of less than 40 nm, advantageously less than 35 nm, very advantageously less than 30 nm.