Charge stabilized electret filter media

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6780226
SERIAL NO

08628327

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Importance

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Abstract

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An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides, oleophobic fluorochemical surfactants, and mixtures thereof.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HOLLINGSWORTH & VOSE COMPANYEAST WALPOLE, MA65

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gahan, Richard E Wrentham, MA 9 126
Lifshutz, Norman Nashua, NH 7 92
Stevens, Graham C Quincy, MA 2 59

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
5099026 Fluorochemical oxazolidinones 80 1991
 
MINNESOTA MINING AND MANUFACTURING COMPANY (5)
* 4874399 Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene) 123 1988
5025052 Fluorochemical oxazolidinones 152 1990
5411576 Oily mist resistant electret filter media and method for filtering 130 1994
* 5417678 Low profile ostomy filter 16 1994
* 5472481 Oily mist resistant electret filter media 119 1995
 
INVISTA NORTH AMERICA S.A.R.L. (1)
* 5558809 Polymer electrets with improved charge stability 38 1995
 
TOYOBO CO., LTD. (1)
4789504 Electretized material for a dust filter 76 1986
 
Her Majesty the Queen in right of Canada as represented by the Minister of National Defence of Canadian Government (1)
* 5038775 Plastic scrim 38 1988
 
TORAY INDUSTRIES, INC. (1)
* 5057710 Electret materials and the method for preparing the electret materials 97 1990
 
W. L. Gore & Associates (UK) Ltd. (1)
* 5496396 Gas filter 11 1994
 
PALL CORPORATION (1)
* 4508775 Gas permeable composite structures 22 1983
 
HOLLINGSWORTH & VOSE COMPANY (1)
* 5645627 Charge stabilized electret filter media 52 1995
 
W. L. GORE & ASSOCIATES, INC. (1)
* 5242747 Gas permeable materials 10 1992
 
GORE HOLDINGS, INC. (1)
* 5342434 Gas permeable coated porous membranes 35 1993
 
MITSUI CHEMICALS, INC. (3)
4626263 High-performance electret and air filter 76 1985
5256176 Film electret and an electret filter 42 1991
* 5304227 Electret filters 23 1993
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 2003/0213,218 Filtering material and device and method of its manufacture 7 2003
 
DELSTAR ELECTROSTATIC, INC. (1)
9074301 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents 0 2011
 
3M INNOVATIVE PROPERTIES COMPANY (2)
* 7390351 Electrets and compounds useful in electrets 6 2006
* 2007/0180,997 ELECTRETS AND COMPOUNDS USEFUL IN ELECTRETS 10 2006
 
DelStar Technologies, Inc. (1)
9618220 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents 0 2014
 
HOLLINGSWORTH & VOSE COMPANY (5)
* 8202340 Waved filter media and elements 6 2009
8257459 Waved filter media and elements 4 2009
* 2010/0107,881 WAVED FILTER MEDIA AND ELEMENTS 11 2009
8197569 Waved filter media and elements 7 2010
8882875 Waved filter media and elements 0 2012
* Cited By Examiner