Filtered venting system for liquid containers which are susceptible to contamination from external bioburden
US6073812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1999 |
| Grant date | Jun 13, 2000 |
| Priority date | — |
| Expiry date | Jan 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1632
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A multi-layer film (22) covers an aperture (21) in a rigid container (10) to provide a filtered venting system (C) for the container. The film includes a porous filter layer (36,36') of a material such as polytetrafluoroethylene foam which filters bioburden from air as it enters the container during the dispensing of a fluid from a nozzle (14) in the container. The film also includes a barrier layer (34,34') of an impermeable material that prevents air from entering the container during transit and storage and prevents blockage of the porous layer with dried fluid. Before dispensing, the film is stretched, thereby destroying the integrity of the barrier layer and allowing air to enter through the porous layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.