Liquid purification or separation – Filter – Material
Reexamination Certificate
2005-12-05
2008-12-09
Menon, Krishnan S (Department: 1797)
Liquid purification or separation
Filter
Material
C210S500350, C210S500270, C210S500100, C210S500420, C210S500410, C210S500390, C210S500360
Reexamination Certificate
active
07462283
ABSTRACT:
The present invention teaches, that the removal of particles of any charge from liquid stream is possible by mechanisms other than sieving with good flow and low pressure drop. The use of a weakly charged or neutral surface on the one or more filters within a pre-selected pH range is used. Consequently, particles that are much smaller than the filter pore size are captured with high efficiency. The essentially neutral or weakly charged material filter surface in the filtration liquid may be formed through the proper selection of filter material or a surface modification of the base filters(s) to create the essentially neutral or weakly charged surface.
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European Search Report, dated Mar. 28, 2007, All prior art previously cited in parent applications.
Kelly, W. P. et al, Effect of Surface Charge and Fluid Properties on Particle Removal Characteristics of a Surface-Optimized REB Filter, Solid State Phenomena, 2001, 271-274, vol. 76-77.
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Goddard Philip
Grant Donald
Kelly Wayne
Thom Volkmar
Entegris, Inc.
King Timothy J.
Menon Krishnan S
Pillion John E.
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