Treated activated carbon for removal of airborne organic and inorganic contaminants
US11000824B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | May 18, 2020 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | May 18, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/70
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter composition effective in reacting with airborne or gaseous organic impurities, such as formaldehyde. The filter composition is formed from a filter substrate, such as for example, a fibrous web or extruded carbon block, treated with tris-(hydroxymethyl) aminomethane. The unexpected result of this combination is a longer lasting filter capable of adsorbing organic airborne impurities for a much longer period of time than an untreated filter media of the same type. The removal of formaldehyde is presented as an illustrious example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.