Electrostatic particle filtration
US5143524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03C3/155
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A vacuum cleaner is disclosed having an on-board electrostatic filtration device for removing ultra fine particles from the suction air stream which is discharged into the vacuum cleaner's dirt collection receptacle. The electrostatic filtration device includes a finely woven conductive mesh made from two electrically insulated sets of conductive filaments between which a low voltage electrical potential difference is applied. The polarity of the electrical potential difference is periodically reversed at low frequency to assist in maintaining filtering effectiveness notwithstanding the accumulation on the mesh of significant amounts of retained particulate matter. High permitivity material is incorporated between filaments to enhance electric fields in the mesh created by the electrical potential difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.