US Patent No: 5,882,519
Number of patents in Portfolio can not be more than 2000
Meltblown ionomer microfibers and non-woven webs made therefrom for gas filters
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Mar 16, 1999
Issued date -
Jul 25, 1997
filing date -
08/900,803
serial no -
In Force
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Abstract
Ethylene/carboxylic acid ionomers may be made, using a meltspun, and particularly meitblown process, into microfibers and thence to filter webs which are efficient gas filters for removing particles having a diameter of from 0.5 to 20 microns from a gas. The webs are effective without a deliberate specific post-charging operation during production. A deliberate post-charging operation can also be carried out to result in further efficiency.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,215,682 Melt-blown fibrous electrets | 300 | 1978 | |
| 4,588,537 Method for manufacturing an electret filter medium | 167 | 1984 | |
| 5,411,576 Oily mist resistant electret filter media and method for filtering | 118 | 1994 | |
| 5,496,507 Method of charging electret filter media | 156 | 1994 | |
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| 5,620,785 Meltblown barrier webs and processes of making same | 71 | 1995 | |
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| 4,592,815 Method of manufacturing an electret filter | 170 | 1985 | |
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| 4,375,718 Method of making fibrous electrets | 183 | 1981 | |
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| 5,534,335 Nonwoven fabric formed from alloy fibers | 22 | 1994 | |
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| 4,626,263 High-performance electret and air filter | 73 | 1985 | |
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| 4,789,504 Electretized material for a dust filter | 71 | 1986 | |