Crankcase ventilating or breathing

Introduced: July 1974

CPC subdivides this area 3x more granularly than IPC with 5 additional codes.

5 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1974.

Child Classifications

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F01M 13/0011 +3 CPC CPC only CPC only
F01M 13/0033 CPC only CPC only
F01M 13/02 by means of additional source of positive or negative pressure since 1974 +2 CPC IPC+CPC Available in IPC and CPC
F01M 13/04 having means for purifying air before leaving crankcase, e.g. removing oil since 1974 +15 CPC IPC+CPC Available in IPC and CPC
F01M 13/06 specially adapted for submersible engines, e.g. of armoured vehicles since 1974 IPC+CPC Available in IPC and CPC
F01M 2013/0005 2nd only CPC only CPC only
F01M 2013/0038 2nd only +2 CPC CPC only CPC only
F01M 2013/0077 2nd only +3 CPC CPC only CPC only