CPC Subgroup
F01N 3/021 by means of filters
Full Title
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00) > for cooling, or for removing solid constituents of, exhaust (by means of electric or electrostatic separators F01N3/01 ) > by means of filters
10 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F01N 3/022 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles
- F01N 3/031 having means for by-passing filters, e.g. when clogged or during cold engine start
- F01N 3/033 in combination with other devices