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PCE
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DIFF Subgroup
F03G 7/04

using pressure differences or thermal differences occurring in nature (F03G7/06 takes precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: using pressure differences or thermal differences occurring in nature

CPC: using pressure differences or thermal differences occurring in nature (F03G7/06 takes precedence)

Full Title

Full titles differ between systems:

IPC:

Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for > using pressure differences or thermal differences occurring in nature

CPC:

Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for > using pressure differences or thermal differences occurring in nature (F03G7/06 takes precedence)

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

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  • F03G 7/045 CPC only CPC only
  • F03G 7/047 CPC only CPC only
  • F03G 7/05 Ocean thermal energy conversion, i.e. OTEC since 1990 IPC+CPC Available in IPC and CPC