Filter unit
US4116646A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1977 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | May 20, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/7536
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The arrangement of the disclosure comprises a filter unit having an upper, inlet chamber and a lower, outlet chamber. A hydrophilic filter separates the upper chamber from the lower chamber and a lower placed hydrophobic filter or membrane separates the lower chamber and the upper chamber. A liquid reservoir is provided in the first chamber between the filter and membrane, and a gas reservoir is provided in the second chamber between the filter and membrane. A liquid admitted to the upper, inlet chamber with a forward differential pressure, that is with the pressure in the upper chamber larger than that in the lower chamber, will flow through the upper hydrophilic filter into the lower chamber. If any gas accumulates it cannot accumulate above the level of the lower hydrophobic membrane. Accordingly no gas flows out of the lower, outlet chamber in the forward direction. If there is a reverse differential pressure, reverse liquid flow is prevented by the hydrophobic membrane and by air trapped above the lower hydrophobic filter against the upper, wet hydrophilic filter. If liquid supply to the upper chamber fails and a forward pressure differential exists between the chambers, forwa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.