Multi-stage nasal filter
US11285345B2 · kind B2 · utility
1Cited by
15References
15Claims
0Family size
Inventor
Key dates
| Filing date | May 22, 2020 |
| Grant date | Mar 29, 2022 |
| Priority date | — |
| Expiry date | May 22, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2239/125
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Intra-nasal filter devices and methods for their manufacture and use are disclosed. An intra-nasal filter device includes: a first stage filter proximate the septum; and a second stage filter comprising a flexible material extending upwardly from the first filter stage filter; wherein the flexible material comprises: an impedance in the range of 0.02 to 0.2 cmH2O; an effective cross-sectional area in the range of 0.2 to 2 square inches; and a plurality of radially extending geometric structures disposed along an axial length of the second stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.