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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.:

US 7476633 B1

PDFFull Text
Date of Patent:
Jan. 13, 2009

Filed:

Feb. 21, 2007

β-spodumene glass-ceramic materials and process for making the same

Applicants:

Marie Jacqueline Monique Comte, Fontenay aux Roses, FR;

Philippe Lehuede, Yerres, FR;

Ronald Leroy Stewart, Elmira, NY (US);

Inventors:

Marie Jacqueline Monique Comte, Fontenay aux Roses, FR;

Philippe Lehuede, Yerres, FR;

Ronald Leroy Stewart, Elmira, NY (US);

Assignee:

Eurokera, Chierry, FR;

Attorneys:

Siwen Chen

Michael W. Russell

Primary Examiner:

Karl E Group

Int. Cl.
CPC ...
C03C 10/12 (2006.01); C03C 10/14 (2006.01);
U.S. Cl.
CPC ...
Abstract

The present invention relates to glass-ceramic materials, processes for making the same and articles comprising the same. The glass-ceramic material has a composition, by weight of the total composition, comprising 55-68% SiO; 18-24% AlO; 3.3-4.1% LiO; 1.5-4.0% ZnO; 1.5-5.0% MgO; 2-5% TiO; 0-2% ZrO; 0-5% BO; 0-8% PO; 0-2% NaO, 0-2% KO; and at least one component resulting from an effective amount of at least one fining agent; wherein: the total of BOand POis at least 1.5% by weight, the total of MgO and ZnO is at least about 3.5% by weight, the total of NaO and KO is less than about 3.0% by weight, the total of PO, BO, NaO and KO is less than about 11% by weight, the weight ratio of the sum total of NaO+KO to the sum total of PO+BO is less than about 0.5; advantageously the total of PO, BO, NaO and KO is less than about 9% by weight and the total of NaO ad KO is less than about 2% by weight; and more advantageously the total of PO, BO, NaO and KO is less than about 7% by weight and the total of NaO ad KO is less than about 1% by weight. The glass-ceramic material comprises β-spodumene solid solution as the predominant crystalline phase.

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