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IPC Subgroup
F22B 37/1

Water tubes; Accessories therefor

Introduced: September 1968

Last revised: January 2006

Full Title

Component parts or details of steam boilers > applicable to more than one kind or type of steam boiler > Water tubes; Accessories therefor

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 37/12 Forms of water tubes, e.g. of varying cross-section
  • F22B 37/14 Supply mains, e.g. rising mains, down-comers, in connection with water tubes
  • F22B 37/16 Return bends
  • F22B 37/18 Inserts, e.g. for receiving deposits from water
  • F22B 37/2 Supporting arrangements, e.g. for securing water-tube sets

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