High efficiency synthetic filter medium
US6123752A · kind A · utility
77Cited by
39References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1998 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Sep 3, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2238
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A high efficiency filtration medium comprised of a nonwoven filter web of electret charged fibers of a nonconductive thermoplastic resin having a resistivity greater than 10.sup.14 ohm-cm, preferably polypropylene. The nonwoven filter web has a basis weight (BW) of less than 60 grams/m.sup.2, an effective fiber diameter (EFD) of less than 5 microns and a penetration (PEN) of less than 0.03%, wherein the ratio); EQU BW/(EFD.PEN) is greater than 200. The invention filter medium can be easily used in applications requiring HEPA performance at relatively low pressure drops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.