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:
Feb. 19, 2002
Filed:
Nov. 12, 1999
Ichiro Hazeyama, Tokyo, JP;
Kazuhiro Ikuina, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A glass having an oxide-converted composition of 35 to 65 wt % of SiO , 5 to 35 wt % of B O , 2 to 20 wt % of CaO, 5 to 25 wt % of Al O where the ratio of CaO to Al O is 1/1 to 1/2.5, 0.5 to 5 wt % of TiO , 0.5 to 5 wt % of ZrO , 0.5 to 5 wt % of ZnO, 0 to 5 wt % of MgO, 0 to 5 wt % of SrO, 0 to 5 wt % of BaO and 0 to 1 wt % of the total of group 1A element oxides such as Na O, K O and Li O, or a glass having an oxide-converted composition of 10 to 45 wt % of SiO , 20 to 50 wt % of CaO, 20 to 45 wt % of Al O , 0.1 to 5 wt % of MgO, 0.1 to 5 wt % of SrO, 0.1 to 5 wt % of BaO, 0.1 to 5 wt % of TiO , 0.1 to 5 wt % of ZnO, 0.1 to 5 wt % of ZrO and 0 to 3 wt % of a group 1A element oxide has a low glass softening point, can be calcined as a composite with a variety of ceramics at a temperature below 1000° C., precipitates crystals during the calcination process, and can provide a glass ceramic exhibiting a low dielectric constant and a low dielectric loss.