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CPC Subgroup
F22D 5/14

responsive to thermal expansion and contraction, e.g. of solid elements

Full Title

Controlling water feed or water level; Automatic water feeding or water-level regulators > responsive to thermal expansion and contraction, e.g. of solid elements

Filing statistics

CPC F22D 5/14 belongs to the parent subclass F22D, which recorded 5,699 patent applications worldwide between 2013 and 2023. Annual filings grew from 227 in 2013 to 702 in 2023 (+209%), peaking at 774 applications in 2020. The most active applicants in class F22 are XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (544 applications), SIEMENS (306 applications) and PHILIP MORRIS PRODUCTS (258 applications).

Source: EPO PATSTAT, worldwide filings

1 direct subcode

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class F22, 2013–2023, worldwide · Source: EPO PATSTAT

  1. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 544
  2. SIEMENS DE 306
  3. PHILIP MORRIS PRODUCTS CH 258
  4. GENERAL ELECTRIC TECHNOLOGY CH 254
  5. MITSUBISHI HITACHI POWER SYSTEMS JP 235
  6. XIAN JIAOTONG UNIVERSITY 214
  7. MITSUBISHI HEAVY INDUSTRIES JP 195
  8. MITSUBISHI HITACHI POWER SYSTEMS 169
  9. HARBIN BOILER COMPANY 166
  10. VALMET TECHNOLOGIES FI 155