Filters with a graduated structure and a method for producing the same
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United States of America Patent
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Issued Date -
Mar 18, 2004
app pub date -
Jul 21, 2003
filing date -
Jan 19, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The aim of the invention is to provide filters with a graduated structure, which are simple to produce and exhibit excellent properties in terms of their permeability to liquids and/or gases. To achieve this, the filters are produced from sinterable material consisting of at least two layers of differing pore size, a first layer having a minimum pore size of 0.005 .mu.m and consisting of metal oxide or mixtures of metal oxide and the additional layer that is connected to the first layer consisting of a material other than metal oxide. The invention also relates to a method for producing the inventive filters and to the use thereof.
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