US Patent No: 4,904,394

Number of patents in Portfolio can not be more than 2000

Method for selective filtering of a fluid using porous piezoelectric material

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Importance

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Abstract

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
PUBLIC HEALTH LABORATORY SERVICE BOARDEUGENE, OR20

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Blake-Coleman, Barrie C Salisbury, GB2 2 55
Clarke, David J Salisbury, GB 35 415

Cited Art Landscape

Patent Info (Count) # Cites Year
 
FIBER-RESIN CORP. (1)
4,352,570 Vibratory treatment apparatus and method 21 1980
 
T5 LABS LTD. (1)
8,203,568 Sharing a graphical processing unit between a plurality of programs 12 2011
 
Other [Check patent profile for assignment information] (2)
4,279,751 Hydraulic system 6 1979
4,253,962 Non-destructive vibratory cleaning system for reverse osmosis and ultra filtration membranes 43 1979

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
ITO, YASUHIRO (2)
5,770,089 Water treatment method using tourmaline 8 1994
5,800,708 Interfacial purifying apparatus using tourmaline 2 1997
 
BROTHER KOGYO KABUSHIKI KAISHA (1)
8,172,389 Filter, liquid jetting apparatus, and liquid transporting apparatus 0 2008
 
GEORG FRITZMEIER GMBH & CO. KG (1)
7,385,336 Microbiological energy source for driving a consumer 0 2002
 
Kubo Technical Office (1)
5,531,869 Metal catalyst carried on carrier making use of tourmaline and its production 7 1993
 
OUTOKUMPU MINTEC OY (1)
5,900,147 Oscillatable filter medium 1 1997
 
PALL CORPORATION (1)
5,736,051 Polyvinylidene fluoride membrane and method for removing viruses from solutions 38 1994
 
PUBLIC HEALTH LABORATORY SERVICE BOARD (1)
5,160,616 Filtering apparatus 4 1991
 
ROSEDALE PRODUCTS, INC. (1)
5,128,032 Vibrating sieve filter with bars 5 1990
 
TRELLEBORG AB (1)
6,932,356 Protective covers 4 2001
 
Uchida; Yasunari (1)
5,684,061 Bone inducing material 28 1996
 
Yugenkaisha Kubo Technical Office (1)
5,569,388 Method of controlling the growth of microorganism in a liquid with tourmaline crystals 4 1995
 
Other [Check patent profile for assignment information] (3)
5,601,909 Permanent electrode carrier using tourmaline 11 1995
6,241,878 Self-purging in-line filter 8 2000
7,622,510 Method and device for making a dispersion or an emulsion 2 2003