Filter bag with valve
US6070728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1999 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Feb 2, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7897
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hermetic package for fine particulate material. The package is arranged to be filled and vacuumized to hold the fine particulate material therein and isolated from the ambient atmosphere. The package, which may be in the form of a pouch or a gussetted packages, is formed of a flexible material to have at least a front and a rear panel. At least one degassing valve is mounted in at least one of the panels to enable gas within the interior of the package to vent to the ambient atmosphere. A filter sheet, e.g., a spun-bonded plastic, such as Tyvek.RTM., is secured to the interior of the package over the valve to prevent the fine particulate material within the package from entering into the valve and clogging it. The filter sheet may cover only a small portion of one of the panels of the package or may cover a major portion of that panel, or even cover substantially the entire interior of the package. The package includes a top portion forming a mouth, which is arranged to be opened, e.g., peeled or severed, in order to provide access to the particulate material within the interior of the package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.