Patent · US Expired

Integral, multi-asymmetric, semi-permeable membrane

US5919370A · kind A · utility

25Cited by

3References

19Claims

0Family size

Assignee

AKZO NOBEL N.V. · NL

Inventors

Henning Röttger · Kaltenkirchen, DE
Friedbert Wechs · Bad Mergentheim, DE

Key dates

Filing date	Nov 14, 1997
Grant date	Jul 6, 1999
Priority date	—
Expiry date	Nov 14, 2017

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2325/20
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Membranes suitable for use in haemodialysis include a separating layer A with a cut-off between 500 and 5,000,000, a support layer B and a layer C which partly determines the hydraulic permeability. The cut-off and hydraulic permeability can be set independently of one another. The membranes are integral, multi-asymmetric, semi-permeable membranes made from .epsilon.-caprolactam-soluble polymers. The membranes may be in the form of flat, tubular or hollow fiber membranes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.