Method for selective filtering of a fluid using porous piezoelectric material
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United States of America Patent
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Feb 27, 1990
Grant Date -
N/A
app pub date -
Apr 1, 1987
filing date -
Jun 12, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter which is particularly useful with biological material is formed of porous piezoelectric material such as PZT or Polyvinylidene fluoride. By an application of a voltage to the piezoelectric material, the filter body is caused to vibrate so as to inhibit fouling. In a modification, the piezoelectric material is not itself porous but is bonded to a filter membrane such that vibrations of the piezoelectric material are transmitted to the membrane. Through suitable control of the vibration, the selectivity of the filter can be controlled. In other modifications the vibratory movement of the filter membrane can be produced in other ways such as electro-mechanically.
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