Vacuum cleaner
US6238451A · kind A · utility
74Cited by
45References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Jan 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for filtering a dirty air stream in a vacuum cleaner to obtain a clean air stream has subjecting the dirty air stream to a first cyclonic separation stage to obtain a partially cleaned air stream and subjecting the partially cleaned air stream to a second cyclonic separation stage and an electronic filtration stage to obtain the clean air stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.