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IPC Subgroup
F23B 50/02

the fuel forming a column, stack or thick layer with the combustion zone at its bottom

Introduced: January 2006

Full Title

Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone > the fuel forming a column, stack or thick layer with the combustion zone at its bottom

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
COMBUSTION APPARATUS; COMBUSTION PROCESSES
Subclass:
METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL

4 direct subcodes

Child Classifications

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  • F23B 50/04 the movement of combustion air and flue gases being substantially transverse to the movement of the fuel
  • F23B 50/06 the flue gases being removed downwards through one or more openings in the fuel-supporting surface
  • F23B 50/08 with fuel-deflecting bodies forming free combustion spaces inside the fuel layer
  • F23B 50/1 with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed

Top Applicants

Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT

  1. GE (GENERAL ELECTRIC COMPANY) US 2,124
  2. XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
  3. NINGBO FOTILE KITCHENWARE COMPANY 1,363
  4. SIEMENS DE 997
  5. UNITED TECHNOLOGIES CORPORATION (UTC) US 937
  6. GE (GENERAL ELECTRIC COMPANY) 898
  7. VATTI 815
  8. CHINESE ACADEMY OF SCIENCES 719
  9. RINNAI COMPANY 708
  10. MITSUBISHI HITACHI POWER SYSTEMS 670