Patent Classification Explorer PCE

DIFF Main Group

F03G 4/00

Devices for producing mechanical power from geothermal energy

Introduced: January 1990

CPC subdivides this area 4x more granularly than IPC with 10 additional codes.

10 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1990.

Child Classifications

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F03G 4/001 CPC only CPC only
F03G 4/02 with direct fluid contact since 1990 IPC+CPC Available in IPC and CPC
F03G 4/023 +2 CPC CPC only CPC only
F03G 4/031 CPC only CPC only
F03G 4/033 +1 CPC CPC only CPC only
F03G 4/037 CPC only CPC only
F03G 4/04 with deep-well turbo pump since 1990 IPC+CPC Available in IPC and CPC
F03G 4/045 CPC only CPC only
F03G 4/06 with fluid flashing since 1990 IPC+CPC Available in IPC and CPC
F03G 4/063 +1 CPC CPC only CPC only
F03G 4/069 CPC only CPC only
F03G 4/072 CPC only CPC only
F03G 4/074 CPC only CPC only