Highly selective asymmetric membranes for gas separation
US5674629A · kind A · utility
10Cited by
4References
7Claims
0Family size
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Key dates
| Filing date | Sep 26, 1994 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Sep 26, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A highly selective asymmetric membrane for gas separation is provided which comprises rigid aromatic polyimide or copolyimide polymers comprising the monomers diphenyldi(trifluoromethyl)methane 3,4,3',4'-tetracarboxylic acid adianhydride and a monoaromatic metadiamine or a mixture of monoaromatic metadiamines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.