Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2011-03-15
2011-03-15
Arbes, C. J (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S825000, C029S830000, C029S846000
Reexamination Certificate
active
07905014
ABSTRACT:
A multilayer core board10includes tapered first via hole conductors51extending from the outer surface of a first insulating layer24to conductive portions42aof a power source layer42, second via hole conductors52extending from the outer surface of a second insulating layer26to the conductive portions42aof the power source layer42, tapered third via hole conductors53extending from the outer surface of the second insulating layer26to conductive portions40aof a ground layer40, and fourth via hole conductors54extending from the outer surface of a center insulating layer22to the conductive portions40aof the ground layer40. The first via hole conductors51are tapered, and thus the interval distance to the adjacent first via hole conductor51is shorter than straight-shaped first via hole conductors, and thus the pitch of the first via hole conductor51at the positive pole side and the fourth via hole conductor54at the negative pole side can be sufficiently reduced. This point is applicable to the third via hole conductors53.
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Arbes C. J
Ibiden Co. Ltd.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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