Patterned porous polymeric product and process
US5271839A · kind A · utility
11Cited by
6References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1992 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Apr 14, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Porous polymeric structures are formed from a polymeric sheet by sequential contact of the sheet with a solvent for the sheet and then a non-solvent for the sheet. All or a portion of each non-porous sheet surface is masked to prevent a portion of a surface of the sheet from contacting the solvent. The structure can be porous through all or a portion of its thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.