Method for making a vaccum filter device
US5873967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1997 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Mar 24, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A vacuum filter device is disclosed which includes a filter body which is adapted to receive in fluid-tight, sealed relationship a pair of closed containers for solutions to be filtered by a membrane filter positioned within the filter body. A vacuum port in the filter body communicates with the downstream side of the membrane and a venting passageway also located in the filter body communicates with the closed sample container to serve as a vent to atmospheric pressure. The venting passageway is made of an air permeable hydrophobic filter or preferably a small enough opening to prevent the sample solutions from leaking out of the device during normal use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.