Gradient density filter medium
US4793923A · kind A · utility
8Cited by
9References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jan 15, 1988 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Jan 15, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D39/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter medium for filtration of a fluid to flow therethrough from an upstream side to a downstream side thereof, said filter medium comprising a substrate having a density gradient wherein the density is high on the upstream side and low on the downstream side of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.