|  | 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 fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F28 |
HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials Fulltext... Hierarchy... Expanded...C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation Fulltext... Hierarchy... Expanded...F24F 13/00)

|  | F28 |
Note(s) 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. Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass Fulltext... Hierarchy... Expanded...F28B or in the appropriate subclasses of, for example, classes Fulltext... Hierarchy... Expanded...F22, Fulltext... Hierarchy... Expanded...F24, Fulltext... Hierarchy... Expanded...F25, Fulltext... Hierarchy... Expanded...F26, or Fulltext... Hierarchy... Expanded...F27; if no such other subclass is appropriate, such apparatus is classified in subclass Fulltext... Hierarchy... Expanded...F28C or Fulltext... Hierarchy... Expanded...F28D.

|  | F28B |
STEAM OR VAPOUR CONDENSERS (condensation of vapours Fulltext... Hierarchy... Expanded...B01D 5/00; condensation during pretreatment of gases prior to electrostatic precipitation of dispersed particles Fulltext... Hierarchy... Expanded...B03C 3/00; steam engine plants having condensers Fulltext... Hierarchy... Expanded...F01K; liquefaction of gases Fulltext... Hierarchy... Expanded...F25J; details of heat-exchange or heat-transfer arrangements of general application Fulltext... Hierarchy... Expanded...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

P:30 |  | F28B 3/00 |
Condensers in which the steam or vapour comes into direct contact with the cooling medium

P:20 |  | F28B 5/00 |
Condensers employing a combination of the methods covered by groups Fulltext... Hierarchy... Expanded...F28B 1/00 and Fulltext... Hierarchy... Expanded...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

P:0 |  | F28B 11/00 |
Controlling arrangements with features specially adapted for condensers