Patent Classification Explorer PCE

DIFF Main Group

F04D 9/00

Priming; Preventing vapour lock

Introduced: September 1968

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

3 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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F04D 9/001 +1 CPC CPC only CPC only
F04D 9/004 +2 CPC CPC only CPC only
F04D 9/007 +1 CPC CPC only CPC only
F04D 9/02 Self-priming pumps IPC+CPC Available in IPC and CPC
F04D 9/04 using priming pumps; using booster pumps to prevent vapour-lock +3 CPC IPC+CPC Available in IPC and CPC