Patent · US Expired

Fluid-impermeable areas on porous membrane filters and their application

US4969997A · kind A · utility

65Cited by

3References

20Claims

0Family size

Assignee

Sartorius AG · DE

Inventors

Horst Kluver · Dransfeld, DE
Dietmar Nussbaumer · Göttingen, DE
Eberhard Wunn · Höchberg, DE

Key dates

Filing date	Jan 31, 1989
Grant date	Nov 13, 1990
Priority date	—
Expiry date	Jan 31, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D65/003
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention relates to porous membrane filters, specifically mirco- and ultraporous membrane filters, which have fluid-impermeable areas as a result of a change of their structure on one side of the membrane to a film-like state (film-formation). These filters are, for example, very suitable for an assembly in filter cartridges according to the pouring method, because they still have on the side opposite to the filmed-up side a porous structure, which offers an ideal anchoring possibility for penetrating liquid resin.

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