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:
Oct. 16, 2012
Filed:
Aug. 21, 2008
Yoshitaka Mayumi, Hyogo, JP;
Hideyuki Kuribayasi, Hyogo, JP;
Yoshitaka Mayumi, Hyogo, JP;
Hideyuki Kuribayasi, Hyogo, JP;
Nihon Yamamura Glass Co., Ltd., Hyogo, JP;
Abstract
Disclosed is a glass composition which is adapted to use in providing a hermetic seal between a metal and a ceramic, a metal and a metal, and a ceramic and a ceramic, to form crystallized glass having high strength and high thermal expansion which allow it to be used at high temperatures of 950° C. and over. The glass composition is substantially free of alkali metals, and contains, as calculated as oxide, 15-30 mass % of SiO, 0-5 mass % of AlO, 20-35 mass % of BO, 10-25 mass % of CaO, 25-40 mass % of MgO, 3-8 mass % (3.0% excluded) of ZrO, and 0-3 mass % of CeO, wherein the crystallized glass which is formed by firing a glass powder made of the glass composition at a temperature of 850-1050° C. has a thermal expansion coefficient of 90-110×10/° C. at 50-550° C. and flexural strength of not less than 80 MPa.