Uniform heat distribution apparatus and method for electroless n

Coating apparatus – Immersion or work-confined pool type – With tank structure – liquid supply – control – and/or...

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118612, B05C 300

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active

059388455

ABSTRACT:
An electroless plating apparatus heats a plating bath solution with precise uniformity and avoids localized high temperatures within the bath. The electroless plating apparatus achieves this performance using two solution tanks included an inner tank nested inside an outer tank. A distributed heating element encases a plurality of surfaces of the outer tank, which contains an ethylene glycol solution. The inner tank contains a plating bath solution. A substrate is placed inside the inner tank for plating. Each of the outer tank and the inner tank include a device for evenly distributing the applied heat. In one embodiment, the outer tank heat distributing device is a pump which mixes the ethylene glycol solution. The inner tank heat distributing device is a pump which recirculates plating bath solution, applying returning solution via a sparger.

REFERENCES:
patent: 2658839 (1953-11-01), Talmey et al.
patent: 2791516 (1957-05-01), Chambers et al.
patent: 4200607 (1980-04-01), Suzuki
patent: 5217536 (1993-06-01), Matsumura et al.
patent: 5393347 (1995-02-01), Miranda

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