Compositions – Preservative agents – Anti-caking – separative or protective coatings or zones
Reexamination Certificate
2006-02-07
2006-02-07
Anthony, Joseph D. (Department: 1714)
Compositions
Preservative agents
Anti-caking, separative or protective coatings or zones
C252S382000, C252S384000, C252S400620, C252S06230Q, C252S001000, C510S403000, C510S404000, C510S434000, C029S854000, C029S832000, C257SE21506, C427S468000
Reexamination Certificate
active
06994803
ABSTRACT:
The method according to a preferred embodiment of the present invention mitigates the problem of gold contamination during the SMT assembly operations in the manufacture of Hybrid Multi Chip Modules (HMCM), achieving a high assembly process yield. This target is accomplished by protecting, at the first process step, the gold with a thin layer (0.02–0.03 millimeter) of a paste very soluble in water and washing it off.The protective layer obtained with the above described method is very strong. Furthermore it is very easy to remove, since it is soluble in water.
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Giussani Luigi
Lombardi Lorenza
Monopoli Michele
Sirtori Vittorio
Zambon Franco
Anthony Joseph D.
International Business Machines - Corporation
Scully Scott Murphy & Presser
Steinberg William H.
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