Gas extraction from closed containers
US6171368A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D51/244
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus and an associated method of operation are disclosed for removal of gaseous contaminants, particularly oxygen, from closed containers. The apparatus is economical, simple to install and operate, of convenient size, and highly effective. A gas extractor communicates with a container for a gas-sensitive product. A high gas concentration in the container causes operation of the extractor until the gas concentration is reduced to a desired low level, when the extractor operation stops. Separate sensors and controllers responsive to concentrations can be present, or the extractor can be self-actuated by use as a power source of a battery which operates on gas generated by operation of the extractor. The system preferably is used for oxygen extraction from containers holding oxygen-sensitive contents. The preferred extractor includes an electrochemical cell which has a ion-permeable membrane disposed between two electrodes. Reduction of the oxygen occurs at the cathode of the cell and oxidation of an oxygen-containing species occurs at the anode of the cell, thus having the effect of removing the oxygen from the container. Use of a metal-air battery to power the cell allows the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.