US Patent No: 6,780,226
Number of patents in Portfolio can not be more than 2000
Charge stabilized electret filter media
Stats
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Aug 24, 2004
Issued date -
Apr 5, 1996
filing date -
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08/628,327
serial no -
Expired
status (Note)
Importance
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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.
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First Claim
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International Classification(s)
Cited Art Landscape
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,099,026 Fluorochemical oxazolidinones | 77 | 1991 | |
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| * 4,874,399 Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene) | 119 | 1988 | |
| 5,025,052 Fluorochemical oxazolidinones | 147 | 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 | |
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| * 5,558,809 Polymer electrets with improved charge stability | 36 | 1995 | |
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| 4,789,504 Electretized material for a dust filter | 75 | 1986 | |
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| * 5,038,775 Plastic scrim | 35 | 1988 | |
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| * 5,057,710 Electret materials and the method for preparing the electret materials | 96 | 1990 | |
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| * 4,508,775 Gas permeable composite structures | 22 | 1983 | |
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| * 5,645,627 Charge stabilized electret filter media | 49 | 1995 | |
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| * 5,242,747 Gas permeable materials | 10 | 1992 | |
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| * 5,342,434 Gas permeable coated porous membranes | 30 | 1993 | |
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| * 5,496,396 Gas filter | 10 | 1994 | |
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| 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 | |
* Cited By Examiner
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 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 |