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DIFF Subgroup
F03D 9/37

with means for enhancing the air flow within the tower, e.g. by heating

Introduced: January 2016

Full Title

Full titles differ between systems:

IPC:

Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations > Wind motors specially adapted for installation in particular locations > on stationary objects or on stationary man-made structures > within towers, e.g. using chimney effects > with means for enhancing the air flow within the tower, e.g. by heating

CPC:

Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations (hybrid wind-photovoltaic energy systems for the generation of electric power H02S10/12) > Wind motors specially adapted for installation in particular locations (means for mounting or supporting wind motors F03D13/20) > on stationary objects or on stationary man-made structures > within towers, e.g. using chimney effects > with means for enhancing the air flow within the tower, e.g. by heating

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

IPC defines codes here since 2016.

Child Classifications

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  • F03D 9/39 by circulation or vortex formation since 2016 IPC+CPC Available in IPC and CPC
  • F03D 9/41 by using the wind outside the tower, e.g. using ejectors since 2016 IPC+CPC Available in IPC and CPC

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