|  | 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.

|  | F28C |
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION (safety devices in general Fulltext... Hierarchy... Expanded...F16P; fluid heaters having heat generating means Fulltext... Hierarchy... Expanded...F24H; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28D 15/00-F28D 19/00; details of heat-exchange apparatus of general application Fulltext... Hierarchy... Expanded...F28F)

P:0 |  | F28C 1/00 |
Direct-contact trickle coolers, e.g. cooling towers (building construction Fulltext... Hierarchy... Expanded...E04H 5/00; enclosed spaces cooled by trickle Fulltext... Hierarchy... Expanded...F25; component parts of trickle coolers Fulltext... Hierarchy... Expanded...F28F 25/00)

P:10 |  | F28C 3/00 |
Other direct-contact heat-exchange apparatus