Expanded porous thermoplastic polymer membranes

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Reexamination Certificate

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C521S079000, C428S305500, C428S308400, C428S314200

Reexamination Certificate

active

06960616

ABSTRACT:
Open-celled membranes from thermoplastic polymers are prepared from foamed polymer melts by extrusion through a die and particulary suitable for filtration.

REFERENCES:
patent: 5695996 (1997-12-01), Quinn et al.
patent: 5837365 (1998-11-01), Chung
patent: 5847012 (1998-12-01), Shalaby et al.

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