Method and device for evacuating gas tight envelope
US5491957A · kind A · utility
10Cited by
7References
4Claims
0Family size
Inventor
Key dates
| Filing date | Apr 6, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Apr 6, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B31/042
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An improved method and device are provided for evacuating gas from a gas tight envelope such as a bag of plastic film, enclosing solid or granular material. The vacuum probe used in accordance with the invention to evacuate the envelope has one or more parallel grooves or apertures extending its length. The probe is inserted into the envelope in such a way that the grooves or apertures tangentially oppose the contents of the envelope and provide a vacuum, across the length of the probe to prevent blocking of the probe and ceasing evacuation of the gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.