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US5549720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pre-filter for an oxygen concentrator having enhanced filtering area. The pre-filter is positioned so that air entering the concentrator's air compressor is filtered to removed particulate contaminants. The pre-filter has an impermeable housing consisting of four walls in a rectangular configuration. There is, within the housing, a first filter pledget of porous filter material and second filter pledget of porous filter material with an air space in-between the pledgets. Each pledget has an exposed filtering surface and a material thickness of porous filter material. The opening of a conduit tube that is in fluid communication with the air compressor is positioned in the air space between the filter pledgets. Air entering the conduit tube passes through one of the exposed filtering surfaces and one material thickness of porous filter material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.