Spiral-wound filter
US3962097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1971 |
| Grant date | Jun 8, 1976 |
| Priority date | — |
| Expiry date | Apr 22, 1991 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D25/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter unit formed by spirally winding a multi-layer material around a core to form a generally cylindrical construction having two opposing spiral end surfaces. The multilayer material has at least two filter layers and at least two spacer layers formed from a material with a high void volume. The multi-layer material need not include a fluid-impermeable layer. The layers are arranged and adhered along the lengthwise and widthwise edges so that, in use, unfiltered fluid passing through one spiral surface of the filter unit into one spacer layer must pass through a filter layer prior to passing out of the construction through the opposing spiral end surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.