Method for producing electret filter
US5246637A · kind A · utility
24Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | May 1, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/47
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A highly efficient, reliable method is provided for producing an electret filter having an excellent collection efficiency. In this method, a film containing a resin material with high molecular weight is formed and split to form split yarns. The split yarns are then subjected to a charging treatment, and the electret filter is produced from the charged split yarns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.