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CPC Subgroup
F23C 7/02

Disposition of air supply not passing through burner (to obtain a cyclonic tapering flame when burning pulverulent fuel F23C5/32)

Full Title

Combustion apparatus characterised by arrangements for air supply (inlets for fluidisation air F23C10/20; baffles or shields with air supply passages F23M9/04) > Disposition of air supply not passing through burner (to obtain a cyclonic tapering flame when burning pulverulent fuel F23C5/32)

Filing statistics

CPC F23C 7/02 belongs to the parent subclass F23C, which recorded 14,682 patent applications worldwide between 2013 and 2023. Annual filings declined from 1,458 in 2013 to 1,097 in 2023 (-25%), peaking at 1,619 applications in 2016. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,581 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (1,180 applications) and SIEMENS (1,157 applications).

Source: EPO PATSTAT, worldwide filings

2 direct subcodes

Child Classifications

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  • F23C 7/04 to obtain maximum heat transfer to wall of combustion chamber

Top Applicants

Top 10 applicants by patent filingsfor 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