Cup-shaped filtration mask having an undulated surface
US5641555A · kind A · utility
30Cited by
22References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1995 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | May 26, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24603
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Filter media is provided. The filter media comprises a web of melt blown microfibers having one surface substantially flat and the other surface having periodic wrinkle-like undulations. A method of making the filter media is also provided. The filter media is useful in electret filters when charged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.