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DIFF Main Group
F23M 20/00

Details of combustion chambers, not otherwise provided for

Introduced: January 2014

Additional Content IPC

Details of steam boilers , e.g. Mounting or disposition of burners Supplying air or non-combustible liquids or gases , Details of fluidised bed combustion apparatus Burners Details specially adapted for apparatus for combustion of waste or low-grade fuels, e.g. incinerators Grates; Cleaning or raking grates Removal or treatment of combustion products or combustion residues Feeding fuel Casings, linings, walls or doors - Devices for deflecting air, flames or combustion products Safety arrangements Ignition Details of stoves or ranges burning solid fuels , Details of stoves or ranges burning fuels other than solid fuels , e.g. Details of fluid heaters, e.g., heating boilers Details of furnaces, kilns, ovens or retorts ,

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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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