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DIFF Subgroup
F03C 1/24

in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders

Introduced: September 1968

Full Title

Reciprocating-piston liquid engines > with movable cylinders > in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders

Of 5 combined children, 1 exist in both systems.

3 codes are CPC-only extensions, 1 exist only in IPC.

IPC defines codes here since 1990.

Child Classifications

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  • F03C 1/2454 CPC only CPC only
  • F03C 1/2462 CPC only CPC only
  • F03C 1/247 with cylinders in star- or fan-arrangement since 1990 IPC+CPC Available in IPC and CPC
  • F03C 1/253 with cylinder axes generally coaxial with, or parallel to, main shaft axis since 1990 IPC only IPC only

Top Applicants

Top Applicants (IPC)

Class F03,2013–2023, worldwide · Source: EPO PATSTAT

  1. VESTAS DK 3,539
  2. WOBBEN PROPERTIES DE 2,922
  3. SIEMENS GAMESA RENEWABLE ENERGY DK 2,747
  4. GE (GENERAL ELECTRIC COMPANY) US 2,356
  5. BEIJING GOLDWIND SCIENCE & CREATION WINDPOWER EQUIPMENT COMPANY 1,228
  6. SIEMENS DE 886
  7. SGCC(STATE GRID CORPORATION OF CHINA) 831
  8. HUANENG CLEAN ENERGY RESEARCH INSTITUTE 785
  9. MING YANG SMART ENERGY GROUP. 652
  10. LM WIND POWER DK 600

Top Applicants (CPC)

Class F03,2013–2023, worldwide · Source: EPO PATSTAT

  1. VESTAS DK 3,718
  2. WOBBEN PROPERTIES DE 3,602
  3. SIEMENS GAMESA RENEWABLE ENERGY DK 3,016
  4. GE (GENERAL ELECTRIC COMPANY) US 2,594
  5. SIEMENS DE 1,082
  6. BEIJING GOLDWIND SCIENCE & CREATION WINDPOWER EQUIPMENT COMPANY 709
  7. LM WIND POWER DK 671
  8. WOBBEN PROPERTIES 660
  9. SENVION DE 555
  10. BEIJING GOLDWIND SCIENCE & CREATION WINDPOWER EQUIPMENT COMPANY CN 536