Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D27/02)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Combating cavitation, whirls, noise, vibration, or the like; Balancing

CPC: Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D27/02)

Full Title

Full titles differ between systems:

IPC:

Details, component parts, or accessories > Combating cavitation, whirls, noise, vibration, or the like; Balancing

CPC:

Details, component parts, or accessories (machine elements in general F16) > Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D27/02)

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

Child Classifications

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F04D 29/661 +5 CPC CPC only CPC only
F04D 29/669 CPC only CPC only
F04D 29/68 by influencing boundary layers +2 CPC IPC+CPC Available in IPC and CPC