Stretcher of elastic material, air filter unit capable of controlling air permeability including same, and mask including the air filter unit
US12005385B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Nov 17, 2020 |
| Grant date | Jun 11, 2024 |
| Priority date | — |
| Expiry date | Dec 5, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2279/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A mask according to an embodiment of the present disclosure may adjust permeability thereof by including and using an air filter unit which is capable of expanding or contracting, in at least one direction, a filter for filtering particles contained in air passing through the mask by pores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.