Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Reexamination Certificate
2007-01-23
2007-01-23
Fortuna, Ana (Department: 1723)
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
C210S500230, C210S500270, C210S500340, C210S500360, C210S500430, C210S500290, C210S500420
Reexamination Certificate
active
10620715
ABSTRACT:
A defect free semipermeable composite membrane having excellent integrity and high water permeability is provided. Said composite membrane comprises an inside support layer to provide sufficient mechanical strength; an outside barrier layer to provide selective separation; and a middle layer to provide both chemical and physical binding between said support and said barrier layer to bond them together. Three different methods for making said defect free composite membrane are discovered. These methods have been successfully utilized to produce high quality coatings and defect free composite membranes, which are independent of chemical composition and physical structure of said support. In the present invention, ultrasonic sonication is discovered to be effective to speed up the phase inversion process of a membrane casting solution, thus allows produce a composite membrane at a speed higher than those disclosed in the prior art. Said defect free composite membranes have broad applications, ranging from filtration of fruit juice, wine and milk to biotech down stream processing and purification of drinking water, municipal and industrial wastewater.
REFERENCES:
patent: 602872 (1898-04-01), Richards et al.
patent: 3556305 (1971-01-01), Shorr
patent: 3676193 (1972-07-01), Cooper et al.
patent: 4061821 (1977-12-01), Hayano et al.
patent: 4188354 (1980-02-01), Munari et al.
patent: 4645602 (1987-02-01), Barnes et al.
patent: 4690765 (1987-09-01), Linder et al.
patent: 4690766 (1987-09-01), Linder et al.
patent: 4740562 (1988-04-01), Menke et al.
patent: 4774039 (1988-09-01), Wrasidlo
patent: 4810384 (1989-03-01), Fabre
patent: 4941976 (1990-07-01), Bartels et al.
patent: 5022990 (1991-06-01), Doi et al.
patent: 5032331 (1991-07-01), Onishi et al.
patent: 5066401 (1991-11-01), Muller et al.
patent: 5209849 (1993-05-01), Hu et al.
patent: 5282971 (1994-02-01), Degen et al.
patent: 5418053 (1995-05-01), Lin
patent: 5472607 (1995-12-01), Mailvaganam et al.
patent: 5834107 (1998-11-01), Wang et al.
patent: 5914039 (1999-06-01), Mahendran et al.
patent: 6024872 (2000-02-01), Mahendran et al.
patent: 6146747 (2000-11-01), Wang et al.
patent: 6354444 (2002-03-01), Mahendran et al.
patent: 6596167 (2003-07-01), Ji et al.
Accord Partner Limited
Bromberg & Sunstein LLP
Fortuna Ana
LandOfFree
Defect free composite membranes, method for producing said... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Defect free composite membranes, method for producing said..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Defect free composite membranes, method for producing said... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3811115