Melt blown composite HEPA vacuum filter
US6514325B2 · kind B2 · utility
30Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/39
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.