Air filter medium
US11426690B2 · kind B2 · utility
0Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2018 |
| Grant date | Aug 30, 2022 |
| Priority date | — |
| Expiry date | Jul 1, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/204
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An air filter medium reduces a decrease in collection efficiency in the case where a main collection layer and a pre-collection layer having a lower collection efficiency than the main collection layer are used. An air filter medium that collects dust in gas includes a main collection layer and a pre-collection layer that has a lower collection efficiency of NaCl particles having a particle size of 0.3 μm than the main collection layer, is disposed on an upstream side of an air flow with respect to the main collection layer, and has water repellency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.