Positively charged polyvinylidene fluoride membrane
US5282971A · kind A · utility
75Cited by
19References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 11, 1993 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | May 11, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/385
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing positively charged quaternary ammonium groups covalently bonded to the membrane, and a method of using the filter medium to treat a composition, particularly a biological or pharmaceutical composition such as an ophthalmic composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.