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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
F01N 1/02

by using resonance

Introduced: September 1968

Full Title

Silencing apparatus characterised by method of silencing > by using resonance

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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  • F01N 1/023 CPC only CPC only
  • F01N 1/026 CPC only CPC only
  • F01N 1/04 having sound-absorbing materials in resonance chambers IPC+CPC Available in IPC and CPC