• All sections
• F - Mechanical engineeringlightingheatingweaponsblasting
• F22D - Preheating, or accumulating preheated, feed-water for steam generationfeed-water supply for steam generationcontrolling water level for steam generationauxiliary devices for promoting water circulation within steam boilers
• F22D 1/20 - Feed-water heaters, e.g. preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and directly connected to boilers

Patent holdings for IPC class F22D 1/20

Total number of patents in this class: 4

10-year publication summary

Principal owners for this class