Gas filter
US4707467A · kind A · utility
3Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | May 27, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/025
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter for noxious gases such as sulphur dioxide or nitrogen dioxide comprises a keratinous fibre substrate within which is deposited an effective amount of manganese dioxide. The fibres, preferably sheep's wool, may be in the form of a fibrous bat and the manganese dioxide is deposited from acidified permanganate solution. The filter is most effective when maintained in the wet state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.