Vacuum cleaner with dirt detection
US5608944A · kind A · utility
128Cited by
13References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/2857
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The disclosure describes a vacuum cleaner having a dirt sensor circuit usable with an audio detector. The circuit provides amplification of the audio signal, a pulse stretcher, sensitivity selection of a non linear characteristic and visual signal means to indicate high or low levels of dirt concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.