Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1990-11-21
1991-06-11
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156643, 156646, 156654, 156656, 156345, 2041292, 2041294, B44C 122, C03F 102, C03C 1500, B23H 300
Patent
active
050229559
ABSTRACT:
An automatic method and apparatus for the repair of circuit shorts and near-shorts present in narrow bridges or remnants of bridges between circuit lines. By applying a voltage across a pair of lines, certain electrical phenomena take place at the area of the short or near-short. The electrical phenomena thus generated induce a localized etching in either a gas-phase or liquid-phase medium depending upon which embodiment is used. The circuit lines are classified into four groups so that no adjacent lines belong to the same group. All lines in a group are connected to one of four separate electrical conductors. Each conductor is connected to one phase of a four phase ac source. All the shorts and near shorts on a circuit are repaired simultaneously and automatically in a single operation without having to locate the shorts and near shorts.
REFERENCES:
patent: 4919971 (1990-04-01), Chen
Aker David
International Business Machines - Corporation
Powell William A.
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