Metal working – Method of mechanical manufacture – Electrical device making
Patent
1992-06-08
1994-02-22
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
427 97, H01K 310
Patent
active
052876209
ABSTRACT:
A process of producing a multiple-layer glass-ceramic circuit board having a copper conductor, comprising the steps of: forming throughholes in a glass-ceramic green sheet at sites where via-contacts will be formed; filling the throughholes with a powder mixture of a copper powder blended with a ceramic powder, the copper powder and the ceramic powder having a powder particle size providing a packing density comparable with or greater than that of the glass-ceramic green sheet when filled in the throughholes; printing a conductor paste on the green sheet having the throughholes filled with the powder mixture, to form a circuit conductor pattern on the green sheet; laminating a plurality of the green sheets having the conductor pattern formed thereon, to form a laminate body; heating the laminate body to thereby remove a binder therefrom and preliminary-fire the laminate body; and firing the preliminary-fired body.
REFERENCES:
patent: 4599277 (1986-07-01), Brownlow et al.
Hashimoto Kaoru
Kamehara Nobuo
Niwa Koichi
Suzuki Hitoshi
Yamagishi Wataru
Echols P. W.
Fujitsu Limited
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