DIFF Subgroup
F04D 29/68 by influencing boundary layers
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details, component parts, or accessories > Combating cavitation, whirls, noise, vibration, or the like; Balancing > by influencing boundary layers
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) > by influencing boundary layers
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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