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IPC Main Group
F22B 27/00

Instantaneous or flash steam boilers

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
STEAM GENERATION
Subclass:
METHODS OF STEAM GENERATION; STEAM BOILERS

5 direct subcodes

Child Classifications

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  • F22B 27/02 built-up from fire tubes
  • F22B 27/12 built-up from rotary heat-exchange elements, e.g. from tube assemblies
  • F22B 27/14 built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls
  • F22B 27/16 involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes

Top Applicants

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

  1. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 922
  2. MIURA COMPANY 416
  3. HARBIN BOILER COMPANY 390
  4. MITSUBISHI HITACHI POWER SYSTEMS 303
  5. XIAN JIAOTONG UNIVERSITY 287
  6. SGCC(STATE GRID CORPORATION OF CHINA) 257
  7. HUADIAN ELECTRIC POWER RESEARCH INSTITUTE 253
  8. SIEMENS DE 247
  9. MIDEA 243
  10. NORTH CHINA ELECTRIC POWER UNIVERSITY 223