Processes for preparing electret filters
US5143767A · kind A · utility
17Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1989 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Jan 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24826
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Provided herein is a process for preparing an electret filter which comprises feeding a non-woven fabric composed of an electrically charged web of synthetic fibers through a nip of co-operating embossing and flat rolls under pressure and at a temperature below a softening temperature of said synthetic fibers, thereby subjecting the surface of said non-woven fabric to partical fusion bonding and integration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.