F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
 F01 - 
F04
Subsection index
MACHINES
positive displacement
rotary or oscillating piston
liquid and elastic fluid or elastic fluidF01C
liquid onlyF04C
reciprocating piston or other
liquid and elastic fluid or elastic fluidF01B
liquid onlyF04B
non-positive displacement
liquid and elastic fluid or elastic fluidF01D
liquid onlyF03B
ENGINES
positive displacement
rotary or oscillating piston
liquid and elastic fluid or elastic fluidF01C
liquid onlyF03C
reciprocating piston or other
liquid and elastic fluid or elastic fluidF01B
liquid onlyF03C
non-positive displacement
liquid and elastic fluid or elastic fluidF01D
liquid onlyF03B
PUMPS
positive displacement
rotary or oscillating pistonF04C
reciprocating piston or otherF04B
non-positive displacementF04D
  
LIGHTING; HEATING
 F28
HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation F24F 13/30)
 F28

Note(s)

  1. In this class, the following expressions are used with the meanings indicated:
    • "heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid;
    • "heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.
  2. Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass F28B or in the appropriate subclasses of, for example, classes F22, F24, F25, F26, or F27; if no such other subclass is appropriate, such apparatus is classified in subclass F28C or F28D.
 F28B
STEAM OR VAPOUR CONDENSERS (condensation of vapours B01D 5/00; condensation during pretreatment of gases prior to electrostatic precipitation of dispersed particles B03C 3/014; steam engine plants having condensers F01K; liquefaction of gases F25J; details of heat-exchange or heat-transfer arrangements of general application F28F)
P:40 F28B 1/00
Condensers in which the steam or vapour is separated from the cooling medium by walls, e.g. surface condenser
 F28B 1/02
·  using water or other liquid as the cooling medium
 F28B 1/04
·  ·  employing moving walls
 F28B 1/06
·  using air or other gas as the cooling medium
 F28B 1/08
·  ·  employing moving walls  [3]
P:30 F28B 3/00
Condensers in which the steam or vapour comes into direct contact with the cooling medium
 F28B 3/02
·  by providing a flowing coating of cooling liquid on the condensing surface
 F28B 3/04
·  by injecting cooling liquid into the steam or vapour (F28B 3/08 takes precedence)
 F28B 3/06
·  by injecting the steam or vapour into the cooling liquid (F28B 3/08 takes precedence)
 F28B 3/08
·  with rotatable members
P:20 F28B 5/00
Condensers employing a combination of the methods covered by groups F28B 1/00 and F28B 3/00; Other condensers
P:10 F28B 7/00
Combinations of two or more condensers, e.g. provision of reserve condenser
P:50 F28B 9/00
Auxiliary systems, arrangements, or devices
 F28B 9/02
·  for feeding steam or vapour to condensers
 F28B 9/04
·  for feeding, collecting, and storing cooling water or other cooling liquid
 F28B 9/06
·  ·  with provision for re-cooling the cooling water or other cooling liquid
 F28B 9/08
·  for collecting and removing condensate
 F28B 9/10
·  for extracting, cooling, and removing non-condensable gases
P:0 F28B 11/00
Controlling arrangements with features specially adapted for condensers