US Patent No: 6,780,226

Number of patents in Portfolio can not be more than 2000

Charge stabilized electret filter media

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HOLLINGSWORTH & VOSE COMPANYEAST WALPOLE, MA69

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gahan, Richard E Wrentham, MA 11 90
Lifshutz, Norman Nashua, NH 9 67
Stevens, Graham C Quincy, MA 2 52

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Minnesota Mining and Manufacturing Company (6)
4,215,682 Melt-blown fibrous electrets 311 1978
4,874,399 Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene) 118 1988
5,025,052 Fluorochemical oxazolidinones 146 1990
5,411,576 Oily mist resistant electret filter media and method for filtering 125 1994
5,417,678 Low profile ostomy filter 15 1994
5,472,481 Oily mist resistant electret filter media 116 1995
 
MITSUI CHEMICALS, INC. (3)
4,626,263 High-performance electret and air filter 75 1985
5,256,176 Film electret and an electret filter 42 1991
5,304,227 Electret filters 23 1993
 
GORE HOLDINGS, INC. (1)
5,342,434 Gas permeable coated porous membranes 29 1993
 
Her Majesty the Queen in right of Canada as represented by the Minister of National Defence of Canadian Government (1)
5,038,775 Plastic scrim 33 1988
 
HOLLINGSWORTH & VOSE COMPANY (1)
5,645,627 Charge stabilized electret filter media 48 1995
 
INVISTA NORTH AMERICA S.A.R.L. (1)
5,558,809 Polymer electrets with improved charge stability 36 1995
 
PALL CORPORATION (1)
4,508,775 Gas permeable composite structures 22 1983
 
TORAY INDUSTRIES, INC. (1)
5,057,710 Electret materials and the method for preparing the electret materials 96 1990
 
TOYO BOSEKI KABUSHIKI KAISHA (1)
4,789,504 Electretized material for a dust filter 75 1986
 
W. L. GORE & ASSOCIATES, INC. (1)
5,242,747 Gas permeable materials 10 1992
 
W.L. GORE & ASSOCIATES (UK) LTD. (1)
5,496,396 Gas filter 10 1994
 
Other [Check patent profile for assignment information] (1)
5,099,026 Fluorochemical oxazolidinones 77 1991

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
HOLLINGSWORTH & VOSE COMPANY (3)
8,202,340 Waved filter media and elements 3 2009
8,257,459 Waved filter media and elements 1 2009
8,197,569 Waved filter media and elements 3 2010
 
3M INNOVATIVE PROPERTIES COMPANY (1)
7,390,351 Electrets and compounds useful in electrets 5 2006

Maintenance Fees

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Feb 24, 2016
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
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