EP 0868214 A1 19981007 - AIR FILTRATION APPARATUS
Title (en)
AIR FILTRATION APPARATUS
Title (de)
LUFTFILTER
Title (fr)
DISPOSITIF DE FILTRATION D'AIR
Publication
Application
Priority
- GB 9603074 W 19961213
- GB 9526489 A 19951222
Abstract (en)
[origin: GB2308320A] Air filtration apparatus comprises an inlet 14, an outlet 16, a fan 18, a corona discharge cell 20 and an electret filter 22 e.g. polypropylene. In another embodiment, Figure 3, two discharge cells (40, 44) are provided in sequence, and two electret filters (42, 46) the first being thicker than the second. The return current from the filter element (54 Figure 4) can be measured to give an indication of levels of pollutant particles present, the indication being used to control the speed of the fan and show when the filter needs to be replaced.
IPC 1-7
IPC 8 full level
B01D 39/14 (2006.01); B03C 3/155 (2006.01); B03C 3/28 (2006.01); B03C 3/68 (2006.01)
CPC (source: EP)
B03C 3/155 (2013.01); B03C 3/28 (2013.01); B03C 3/68 (2013.01)
Citation (search report)
See references of WO 9723294A1
Designated contracting state (EPC)
CH DE FR GB IT LI NL
DOCDB simple family (publication)
GB 2308320 A 19970625; GB 9626010 D0 19970129; AU 1106097 A 19970717; CA 2240848 A1 19970703; EP 0868214 A1 19981007; GB 9526489 D0 19960221; JP 2000502597 A 20000307; WO 9723294 A1 19970703
DOCDB simple family (application)
GB 9626010 A 19961213; AU 1106097 A 19961213; CA 2240848 A 19961213; EP 96941786 A 19961213; GB 9526489 A 19951222; GB 9603074 W 19961213; JP 52338197 A 19961213