Cellulose-containing filtration materials and methods of making the same
US12304972B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Sep 16, 2021 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Jun 7, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y40/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present disclosure relates to a composition that includes a base layer having an outer surface and a first thickness and a material that includes a plurality of cellulose nanofibers in physical contact with the outer surface, where the composition has an average filtration efficiency of less than or equal to 90% for particles having a characteristic length between about 50 nm and about 100 μm and the composition is characterized by an average inhalation resistance of less than or equal to 35 mm H2O as measured across the first thickness and the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.