Respirator filter having a pleated filter layer
US6161540A · kind A · utility
30Cited by
17References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1998 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Apr 28, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B23/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The filter medium of the present invention includes a pleated filter layer and a flat filter layer adjacent to the pleated filter layer. Both the pleated filter layer and the flat filter layer may contain a thermoplastic material allowing the filter layers to be joined using ultrasonic welding or heat sealing and facilitating manufacturing. The filter medium has a small height which makes it appropriate for use in flat fold respirators and flat filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.