Asymmetric membranes
US4629563A · kind A · utility
314Cited by
7References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1981 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Aug 11, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved ultraporous and microporous membranes are provided with an entirely reticulated structure free of large finger voids. The reticulated support structure has gradually increasing pore size which reaches a maximum of from about 10 to about 20,000 times the diameter of the skin pores at the opposite face. The skin is very thin and has controllable highly uniform skin pores of from about 0.003 to about 3.0 microns in diameter. The structure offers highly desirable properties to such membranes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.