Purification of very slightly contaminated air within a clean room
US6228135A · kind A · utility
15Cited by
7References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 8, 1996 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Apr 8, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2279/51
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An air purifying filter which comprises: (a) an ion-exchange fiber filter and (b) a high- or ultrahigh-performance filter comprising glass fibers is disclosed. The ion-exchange fiber filter preferably comprises a fibrous substrate and ion-exchange groups and hydrophilic groups which are chemically bound to the surface of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.