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PCE
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DIFF Subgroup
F23L 17/02

Tops for chimneys or ventilating shafts; Terminals for flues

Introduced: September 1968

Full Title

Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues > Tops for chimneys or ventilating shafts; Terminals for flues

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

Child Classifications

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  • F23L 17/04 Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet IPC+CPC Available in IPC and CPC
  • F23L 17/06 branched; T-headed IPC+CPC Available in IPC and CPC
  • F23L 17/08 with coaxial cones or louvres IPC+CPC Available in IPC and CPC
  • F23L 17/10 wherein the top moves as a whole IPC+CPC Available in IPC and CPC
  • F23L 17/12 Devices for fastening the top or terminal to chimney, shaft, or flue IPC+CPC Available in IPC and CPC
  • F23L 17/14 Draining devices IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class F23,2013–2023, worldwide · Source: EPO PATSTAT

  1. GE (GENERAL ELECTRIC COMPANY) US 2,124
  2. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
  3. NINGBO FOTILE KITCHENWARE COMPANY 1,363
  4. SIEMENS DE 997
  5. UNITED TECHNOLOGIES CORPORATION (UTC) US 937
  6. GE (GENERAL ELECTRIC COMPANY) 898
  7. VATTI 815
  8. CHINESE ACADEMY OF SCIENCES 719
  9. RINNAI COMPANY 708
  10. MITSUBISHI HITACHI POWER SYSTEMS 670

Top Applicants (CPC)

Class F23,2013–2023, worldwide · Source: EPO PATSTAT

  1. GE (GENERAL ELECTRIC COMPANY) US 2,581
  2. UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
  3. SIEMENS DE 1,157
  4. GE (GENERAL ELECTRIC COMPANY) 994
  5. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
  6. MITSUBISHI HEAVY INDUSTRIES JP 701
  7. MITSUBISHI HITACHI POWER SYSTEMS JP 695
  8. RAYTHEON TECHNOLOGIES CORPORATION US 587
  9. NINGBO FOTILE KITCHENWARE COMPANY 543
  10. GENERAL ELECTRIC TECHNOLOGY CH 490