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. 02, 2004
Filed:
Aug. 20, 2002
Applicant:
Inventors:
Assignee:
Nippon Electric Glass Co., LTD, Otsu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 1/900 ;
U.S. Cl.
CPC ...
B32B 1/900 ;
Abstract
In a sintered glass ceramic product including at least three layers each of which is formed by a glass ceramic material, the layers are stacked to be substantially symmetrical in a stacking direction and integrally sintered. Among the sintered layers, each of outermost layers and an inner layer adjacent thereto have crystal phases different from each other. Each of the outermost layers and the inner layer have thermal expansion coefficients &agr;1 and &agr;2 selected so that the relationship given by 0<&agr;2−&agr;1<5 ppm is satisfied.