Charge stabilized electret filter media
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United States of America Patent
Stats
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Aug 24, 2004
Grant Date -
N/A
app pub date -
Apr 5, 1996
filing date -
Feb 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.

First Claim
Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | Total Patents |
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HOLLINGSWORTH & VOSE COMPANY | EAST WALPOLE, MA | 70 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Gahan, Richard E | Wrentham, MA | 11 | 150 |
Lifshutz, Norman | Nashua, NH | 7 | 109 |
Stevens, Graham C | Quincy, MA | 2 | 65 |
Cited Art Landscape
Patent Info | (Count) | # Cites | Year |
---|---|---|---|
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5099026 Fluorochemical oxazolidinones | 80 | 1991 | |
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* 4874399 Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene) | 127 | 1988 | |
5025052 Fluorochemical oxazolidinones | 153 | 1990 | |
5411576 Oily mist resistant electret filter media and method for filtering | 132 | 1994 | |
* 5417678 Low profile ostomy filter | 16 | 1994 | |
* 5472481 Oily mist resistant electret filter media | 120 | 1995 | |
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* 5558809 Polymer electrets with improved charge stability | 39 | 1995 | |
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4789504 Electretized material for a dust filter | 80 | 1986 | |
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* 5038775 Plastic scrim | 38 | 1988 | |
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* 5057710 Electret materials and the method for preparing the electret materials | 99 | 1990 | |
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* 5496396 Gas filter | 11 | 1994 | |
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* 4508775 Gas permeable composite structures | 23 | 1983 | |
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* 5645627 Charge stabilized electret filter media | 55 | 1995 | |
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* 5242747 Gas permeable materials | 10 | 1992 | |
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* 5342434 Gas permeable coated porous membranes | 35 | 1993 | |
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4626263 High-performance electret and air filter | 76 | 1985 | |
5256176 Film electret and an electret filter | 42 | 1991 | |
* 5304227 Electret filters | 23 | 1993 |
Patent Citation Ranking
Forward Cite Landscape
Patent Info | (Count) | # Cites | Year |
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9074301 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents | 0 | 2011 | |
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* 2003/0213,218 Filtering material and device and method of its manufacture | 10 | 2003 | |
9909767 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents | 0 | 2014 | |
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* 7390351 Electrets and compounds useful in electrets | 10 | 2006 | |
* 2007/0180,997 ELECTRETS AND COMPOUNDS USEFUL IN ELECTRETS | 11 | 2006 | |
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9618220 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents | 0 | 2014 | |
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* 8202340 Waved filter media and elements | 8 | 2009 | |
8257459 Waved filter media and elements | 6 | 2009 | |
* 2010/0107,881 WAVED FILTER MEDIA AND ELEMENTS | 15 | 2009 | |
8197569 Waved filter media and elements | 9 | 2010 | |
8882875 Waved filter media and elements | 1 | 2012 | |
9718020 Waved filter media and elements | 0 | 2013 | |
9687771 Waved filter media and elements | 0 | 2014 |
Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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