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CPC Subgroup Additional Only
F23J 2900/13005

Protections for chimneys or flue tops against external factors, e.g. birds

Full Title

Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes > Protections for chimneys or flue tops against external factors, e.g. birds

Filing statistics

CPC F23J 2900/13005 belongs to the parent subclass F23J, which recorded 23,943 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,318 in 2013 to 2,351 in 2023 (+78%), peaking at 3,207 applications in 2020. 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

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