DIFF Subgroup
F16K 31/122 the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence)
Introduced: July 1974
Title
Titles differ between systems:
IPC: the fluid acting on a piston
CPC: the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence)
Full Title
Full titles differ between systems:
IPC:
Operating means; Releasing devices > actuated by fluid > the fluid acting on a piston
CPC:
Operating means; Releasing devices > actuated by fluid ( ; fluid-actuated check valves F16K15/00; fluid-actuated safety valves F16K17/00) > the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence)
CPC subdivides this area 6x more granularly than IPC with 5 additional codes.
5 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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