Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Reexamination Certificate
2004-11-04
2011-12-13
Phasge, Arun S (Department: 1724)
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
C210S653000, C210S654000, C210S655000, C210S321750, C210S500270, C204S540000
Reexamination Certificate
active
08075780
ABSTRACT:
The present invention is an ultrafiltration (UF) membrane having a nominal molecular weight cut off (NMWCO) of from about 0.5 KD to about 10 KD wherein the membrane surfaces have a charge that is either positive or negative. The present invention is also a method of using the charged UF membrane to purify and concentrate synthetic biological molecules by using the charged surface either to repel the synthetic biomolecules retaining them in the retentate or to attract the synthetic biomolecules preferentially for filtration through the membrane.
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Millipore Corporation
Phasge Arun S
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