Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-08-30
2005-08-30
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S830000, C029S832000, C205S125000, C205S291000, C205S292000
Reexamination Certificate
active
06935018
ABSTRACT:
A method for forming a copper-Invar-copper (CIC) laminate having an intermetallic layer of negligible thickness, and a structure associated with the CIC laminate. Starting with a block of Invar, the method includes a cleaning step followed by an electroplating step. The cleaning step electrochemically cleans the block of Invar with an acid solution while applying a negative voltage bias to the block of Invar. The electroplating step electroplates copper on the block of Invar, resulting in the block of Invar being sandwiched between two layers of copper, such that an intermetallic layer of zero or negligible thickness is disposed between the block of Invar and each layer of copper. Each layer of copper has a uniform thickness. If the starting block of Invar contains a through hole, then the electroplating step will plate a ring of copper on the through hole wall. The ring of copper makes a seamless connection with the two layers of copper, because the ring of copper and the two layers of copper each have the same grain structure.
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Galasco Raymond T.
McClure Bonnie S.
Richards Craig W.
Arbes Carl J.
International Business Machines - Corporation
Schmeiser Olsen & Watts
Steinberg William H.
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