US Patent No: 5,914,154

Number of patents in Portfolio can not be more than 2000

Non-porous gas permeable membrane

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Abstract

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A process for placing an ultra thin layer of a non-porous gas permeable polymer continuously over an entire filter surface area allows the fabrication of compact, high flux, fouling resistant gas filters. The process involves contacting a dilute coating solution of gas permeable polymer in a solvent with one side of a microporous substrate. The pore size of the substrate is chosen for its ability to effectively filter the gas permeable polymer from the coating solution. Solvent of the coating solution is made to flow through the microporous substrate which causes an ultra thin layer of polymer to build up on the side of substrate. When a desired thickness of polymer is built up, the solution and solvent is removed and residual solvent is evaporated, preferably by passing a gas at high rate over the surface of the polymer layer. This process can be used to coat flat sheet and hollow fiber substrates. The process is particularly useful for coating multiple hollow fibers assembled in modules which by virtue of the high surface area density of small diameter fibers and the efficient packing of many fibers in the modules, provide very high filter surface area in a small volume. The coated fiber modules thus can be used as high flow rate gas filters in applications such as filtering nuisance particules from recovered gas streams, collecting hazardous or valuable droplets suspended in a gas process stream for protection or salvage. Specific applications include filtering air for microelectronic circuit assembly facilities and filtering microbes from the atmosphere in biomedical "clean rooms". A preferred gas permeable polymer for use with this invention is an amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxole. The superior hydrophobicity and oleophobicity of this material in the form of a non-porous, continuous layer provides a barrier for solid particles and liquid droplets from blocking flow through a gas filter. Furthermore, a gas filter made according to this invention can be easily cleaned and restored to near-original gas flux performance.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CMS TECHNOLOGIES HOLDINGS, INC.WILMINGTON, DE15

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nemser, Stuart Marshall Wilmington, DE 8 238

Cited Art Landscape

Patent Info (Count) # Cites Year
 
E. I. DU PONT DE NEMOURS AND COMPANY (2)
5,051,114 Perfluorodioxole membranes 103 1990
5,238,471 Spray-applied fluoropolymer films for gas separation membranes 25 1992
 
PERMEA, INC. (2)
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ALBANY INTERNATIONAL CORP. (1)
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Allied Signal (1)
4,767,643 Method of continuously vacuum impregnating fibrous sheet material 14 1986
 
BARKLEY & DEXTER LABORATORIES, INC. (1)
4,840,819 Method for preparing composite membranes for enhanced gas separation 17 1987
 
EMD MILLIPORE CORPORATION (1)
5,554,414 Process for forming membrane having a hydrophobic fluoropolymer surface 30 1995
 
FRESENIUS AG (1)
4,844,871 Method of determining the partial pressure of gases in blood and an apparatus for performing the method 24 1987
 
KURARAY CO., LTD. (1)
4,938,778 Composite hollow fiber type separation membranes processes for the preparation thereof and their use 39 1986
 
MEMBRANE TECHNOLOGY AND RESEARCH, INC. (1)
4,857,080 Ultrathin composite metal membranes 45 1987
 
OLYMPUS OPTICAL CO., LTD. (1)
4,347,204 Flexible tube and method of manufacturing same 32 1980
 
REXAM INDUSTRIES CORP. (1)
5,523,118 Method of coating microporous membranes 23 1994
 
The United States of America as represented by the Secretary of Commerce (1)
5,258,202 Methods of making and using improved microporous hollow fibers, the improved hollow fibers and tube bundles constructed of the improved fibers 16 1990
 
UOP LLC (1)
4,243,701 Preparation of gas separation membranes 85 1979
 
W. L. GORE & ASSOCIATES, INC. (1)
5,116,650 Dioxole/TFE copolymer composites 54 1990

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CMS TECHNOLOGIES HOLDINGS, INC. (4)
6,299,777 Osmotic distillation process 10 1999
6,569,341 Osmotic distillation process 6 2001
8,293,112 Removal of water and methanol from fluids 0 2007
8,506,815 Removal of water from fluids 0 2012
 
WILSON WOLF MANUFACTURING CORPORATION (4)
8,518,692 Gas permeable cell culture device and method of use 0 2009
8,697,443 Cell culture methods and devices utilizing gas permeable materials 0 2010
8,158,426 Cell culture methods and devices utilizing gas permeable materials 1 2011
8,158,427 Cell culture methods and devices utilizing gas permeable materials 1 2011
 
Donaldson Company, Inc. (3)
7,641,055 Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy 2 2005
7,910,003 Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy 2 2009
8,141,716 Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy 0 2011
 
Ausimont S.p.A. (2)
6,469,116 Amorphous fluoropolymer manufactured articles 22 1999
6,726,840 Membranes of (per)fluorinated amorphous polymers 3 2000
 
IDEX HEALTH & SCIENCE LLC (2)
7,144,443 Axial transfer line degassing 3 2004
7,713,331 Axial transfer line degassing 2 2006
 
L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE (2)
6,540,813 Method of preparing composite gas separation membranes from perfluoropolymers 11 2001
6,923,846 Method of preparing composite gas separation membranes from perfluoropolymers 1 2003
 
WILSON WOLF MANUFACTURING (2)
8,415,144 Cell culture methods and devices utilizing gas permeable materials 0 2006
8,168,432 Cell culture methods and devices utilizing gas permeable materials 1 2011
 
DATALOG ACQUISITION, LLC (1)
7,111,503 Sheet-form membrane sample probe, method and apparatus for fluid concentration analysis 10 2004
 
DATALOG TECHNOLOGY INC. (1)
7,658,094 Sheet-form membrane sample probe, method and apparatus for fluid concentration analysis 1 2006
 
EATON CORPORATION (1)
8,038,770 Separator for degassing fluid 0 2008
 
Electric Power Research Institute, Inc. (1)
6,217,634 Apparatus and method for monitoring and purifying dielectric fluids 8 1999
 
EMD MILLIPORE CORPORATION (1)
8,039,206 Detection of micro-organisms 0 2000
 
KATHOLIEKE UNIVERSITEIT LEUVEN (1)
7,818,996 High throughput screening for rapid development of membranes and membrane processes 0 2005
 
W. L. GORE & ASSOCIATES, INC. (1)
6,617,151 Method of closing a cell containment device with a wet seal 0 2000