Filters employing porous strongly acidic polymers
US7022164B2 · kind B2 · utility
4Cited by
51References
19Claims
0Family size
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Key dates
| Filing date | Aug 25, 2003 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Aug 25, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A clean, high efficiency, low pressure drop, adsorptive filter material that is porous and includes an acidic functional group. The filter can include, for example, a non-woven filter composite has a porous sulfonated divinyl benzene styrene copolymer beads having sulfonic acid functional side groups. The non-woven filter is used to remove molecular bases, including ammonia, organic amines, inides, aminoalcohols, alcoholoamines from the atmosphere used in semiconductor fabrication and other processes that require uncontaminated gaseous environments of high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.