Electrically charged filtration media
US6048614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/699
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A nonwoven filter media or mat (1) formed from a plurality of elongated generally hollow fibers (20) each having an internal cavity (22) which has an opening (24), smaller than the cavity width, to the fiber (20) surface and each retaining within its internal cavity (22) an electrically chargeable powder particle material. The electrically chargeable material can be a pure electrically chargeable dielectric powder material or a mixture of oppositely chargeable dielectric powder particles (18). The small solid particles (18), which can be PTFE, CTFE, halogenated polymers or any other electrically chargeable dielectric powder particles, are permanently entrapped within the longitudinal cavities (22) of the fibers (20) without the use of an adhesive. The electrically charged material remains within the wicking fiber cavities (22) and generally does not enter the space between the wicking fibers yet through the longitudinal openings (24) the electrically charged material is in full communication with the fluid stream flowing past the fibers (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.