Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2005-04-12
2005-04-12
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S209000, C428S210000, C428S699000, C428S697000, C428S701000, C428S702000, C501S002000, C501S005000, C501S008000, C501S055000, C501S065000
Reexamination Certificate
active
06878464
ABSTRACT:
A glass-ceramic composite material for use in forming a multilayered circuit substrate is provided which has a low dielectric constant, but exhibits a relatively high thermal expansion coefficient. Specifically, the glass-ceramic composite material comprises a glass power and a ceramic powder. The glass powder contains: about 30 to 60 mol % of SiO2, about 20 to 40 mol % of BaO, 0 to about 40 mol % of MgO, 0 to about 40 mol % of ZnO, 0 to about 20 mol % of B2O3, with the total content of MgO and ZnO being about 10 to 40 mol %. The ceramic powder contains an alumina powder. The content of the glass powder is set to be at least about 50 wt %. A sintered compact formed by sintering the above glass powder and the above ceramic powder contains a BaO.Al2O3.2SiO2(BaAl2Si2O8) crystal, and its Q value becomes about 400 or more when a measured frequency is 10 GHz.
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Chikagawa Osamu
Moriya Yoichi
Sugimoto Yasutaka
Blackwell-Rudasill G.
Dickstein Shapiro Morin & Oshinsky LLP.
Jones Deborah
Murata Manufacturing Co. Ltd.
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