by means of filters

Introduced: January 2000

Full Title

Full titles differ between systems:

IPC:

Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust > for cooling, or for removing solid constituents of, exhaust > by means of filters

CPC:

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

CPC subdivides this area 3x more granularly than IPC with 6 additional codes.

6 codes are CPC-only extensions.

IPC defines codes here since 2000.

Child Classifications

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F01N 3/0211 CPC only CPC only
F01N 3/0212 CPC only CPC only
F01N 3/0214 CPC only CPC only
F01N 3/0215 CPC only CPC only
F01N 3/0217 CPC only CPC only
F01N 3/0218 CPC only CPC only
F01N 3/022 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous since 2000 +4 CPC IPC+CPC Available in IPC and CPC
F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles since 2000 +8 CPC IPC+CPC Available in IPC and CPC
F01N 3/031 having means for by-passing filters, e.g. when clogged or during cold engine start since 2000 IPC+CPC Available in IPC and CPC
F01N 3/033 in combination with other devices since 2000 +1 CPC IPC+CPC Available in IPC and CPC