Coating processes – Measuring – testing – or indicating
Patent
1986-12-10
1988-09-27
Lusignan, Michael R.
Coating processes
Measuring, testing, or indicating
427345, 4274431, B05D 104
Patent
active
047741015
ABSTRACT:
An apparatus coupled to an electroless copper plating bath for analyzing controlling, on-line, the primary constituents of the bath is described. The apparatus detects and controls not only the copper concentration of the bath by optical means, but the concentrations of hydroxyl ion, formaldehyde reducing agent and cyanide ion as well.
REFERENCES:
patent: 4286965 (1981-09-01), Vanhumbeeck
patent: 4350717 (1982-09-01), Araki
patent: 4623554 (1986-11-01), Kaschak
patent: 4650691 (1987-03-01), Kinoshita
Harris John E.
Rees, Jr. Walter H.
American Telephone and Telegraph Company, AT&T Technologies, Inc
Anderson Roderick B.
Lusignan Michael R.
Padgett Marianne L.
Spivak Joel F.
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