IPC Classification

Class code (prefix) Descriptions Number of results
F22D 1/00 Feed-water heaters, e.g. preheaters
F22D 1/02 Feed-water heaters, e.g. preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
F22D 1/04 Feed-water heaters, e.g. preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement
F22D 1/06 Feed-water heaters, e.g. preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement in horizontal arrangement
F22D 1/08 Feed-water heaters, e.g. preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
F22D 1/10 Feed-water heaters, e.g. preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement in horizontal arrangement
F22D 1/12 Control devices, e.g. for regulating steam temperature
F22D 1/14 Safety or venting devices
F22D 1/16 Feed-water heaters, e.g. preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
F22D 1/18 Feed-water heaters, e.g. preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and heated indirectly
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
F22D 1/22 Feed-water heaters, e.g. preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and provided for rotary movement
F22D 1/24 Feed-water heaters, e.g. preheaters with fire tubes or flue ways traversing feed-water vessels
F22D 1/26 Feed-water heaters, e.g. preheaters with means, other than tubes, to separate water and heating medium, e.g. bulk heaters without internal flues or tubes, jacketted smoke-boxes or flues
F22D 1/28 Feed-water heaters, e.g. preheaters for direct heat transfer, e.g. by mixing water and steam
F22D 1/30 Feed-water heaters, e.g. preheaters for direct heat transfer, e.g. by mixing water and steam with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water
F22D 1/32 Feed-water heaters, e.g. preheaters arranged to be heated by steam, e.g. bled from turbines
F22D 1/34 Feed-water heaters, e.g. preheaters arranged to be heated by steam, e.g. bled from turbines and returning condensate to boiler with main feed supply
F22D 1/36 Water and air preheating systems
F22D 1/38 Constructional features of water and air preheating systems
F22D 1/40 Combinations of exhaust-steam and smoke-gas preheaters
F22D 1/42 Feed-water heaters, e.g. preheaters specially adapted for locomotives
F22D 1/44 Smoke-gas preheaters
F22D 1/46 Exhaust-steam preheaters
F22D 1/48 Feed-water heaters, e.g. preheaters specially adapted for locomotives - Details
F22D 1/50 Feed-water heaters, e.g. preheaters incorporating thermal de-aeration of feed-water
F22D 3/00 Accumulators for preheated water
F22D 3/02 Accumulators for preheated water arranged within combustion chambers
F22D 3/04 Accumulators for preheated water combined with steam accumulators
F22D 3/06 Accumulators for preheated water directly connected to boilers
F22D 3/08 Accumulators for preheated water specially adapted for locomotives
F22D 3/10 Control devices
F22D 5/00 Controlling water feed or water level; Automatic water feeding or water-level regulators
F22D 5/02 Controlling water feed or water level; Automatic water feeding or water-level regulators with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level
F22D 5/04 Controlling water feed or water level; Automatic water feeding or water-level regulators with pivoting buckets
F22D 5/06 Controlling water feed or water level; Automatic water feeding or water-level regulators with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level
F22D 5/08 Controlling water feed or water level; Automatic water feeding or water-level regulators with float-actuated valves
F22D 5/10 Controlling water feed or water level; Automatic water feeding or water-level regulators with float-actuated valves and with pistons or membranes unitary with the feed inlet valves
F22D 5/12 Controlling water feed or water level; Automatic water feeding or water-level regulators with float-actuated valves and with dipping tubes
F22D 5/14 Controlling water feed or water level; Automatic water feeding or water-level regulators responsive to thermal expansion and contraction, e.g. of solid elements
F22D 5/16 Controlling water feed or water level; Automatic water feeding or water-level regulators responsive to thermal expansion and contraction, e.g. of solid elements of fluids
F22D 5/18 Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps
F22D 5/20 Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps without floats
F22D 5/22 Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps with floats
F22D 5/24 Controlling water feed or water level; Automatic water feeding or water-level regulators with electric switches
F22D 5/26 Automatic feed-control systems
F22D 5/28 Automatic feed-control systems responsive to steam pressure
F22D 5/30 Automatic feed-control systems responsive to both water level and amount of steam withdrawn or steam pressure
F22D 5/32 Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
F22D 5/34 Applications of valves
F22D 5/36 Automatic feed-control systems for feeding a number of steam boilers designed for different ranges of temperature and pressure
F22D 7/00 Auxiliary devices for promoting water circulation
F22D 7/02 Saddles or like directing plates fitted to furnace tubes
F22D 7/04 Injectors for water or steam
F22D 7/06 Rotary devices, e.g. propellers
F22D 7/08 Arrangements of pumps, e.g. outside the boilers
F22D 7/10 Arrangements of pumps, e.g. outside the boilers within the boilers
F22D 7/12 Control devices
F22D 7/14 Auxiliary devices for promoting water circulation specially adapted for locomotive boilers
F22D 11/00 Feed-water supply not provided for in other main groups
F22D 11/02 Arrangements of feed-water pumps
F22D 11/04 Arrangements of feed-water pumps with means to eliminate steam formation
F22D 11/06 Arrangements of feed-water pumps for returning condensate to boiler