Electricity: electrical systems and devices – Electric charge generating or conducting means
Reexamination Certificate
2007-12-11
2007-12-11
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Electric charge generating or conducting means
Reexamination Certificate
active
11389772
ABSTRACT:
The present invention provides a method and apparatus for the dry fluxing of at least one component and/or solder surface via electron attachment. In one embodiment, there is provided a method for removing oxides from the surface of a component comprising: providing a component on a substrate wherein the substrate is grounded or has a positive electrical potential to form a target assembly; passing a gas mixture comprising a reducing gas through an ion generator comprising a first and a second electrode; supplying an amount of voltage to at least one of the first and second electrodes sufficient to generate electrons wherein the electrons attach to at least a portion of the reducing gas and form a negatively charged reducing gas; and contacting the target assembly with the negatively charged reducing gas to reduce the oxides on the component.
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N. Potter, et al., “Fluxless Soldering Under Activated Atmosphere at Ambient Pressure.” , Jun. 29, 2001.
N. Koopman, et al., “Fluxless Flip Chip Solder Joining,” pp. 919-931, 1995.
Dong Chun Christine
McDermott Wayne Thomas
Patrick Richard E.
Schwarz Alexander
Air Products and Chemicals Inc.
Jackson Stephen W.
Rossi Joseph D.
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