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 13/00)
 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.
 F28G
CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general B08B 9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility F22B 37/00; removal or treatment of combustion products or combustion residues F23J; removing ice from heat-exchange apparatus F28F 17/00)
 F28G
Subclass index
APPLIANCES FOR CLEANING: NON-ROTARY; ROTARY; OTHERS; DETAILS 1/00; 3/00; 13/00; 15/00
CLEANING PROCESSES BY: DISTORTION; VIBRATION; FLUSHING OR WASHING; COMBUSTION; OTHERS 5/00; 7/00; 9/00; 11/00; 13/00
COMBINATION OF PROCESSES 13/00
P:60 F28G 1/00
Non-rotary, e.g. reciprocated, appliances (F28G 3/00 takes precedence)
P:50 F28G 3/00
Rotary appliances
P:40 F28G 5/00
Cleaning by distortion (by vibration F28G 7/00)
P:30 F28G 7/00
Cleaning by vibration
P:20 F28G 9/00
Cleaning by flushing or washing, e.g. with chemical solvents (appliances using jets of fluid for removing debris F28G 1/00, F28G 3/00)
P:10 F28G 11/00
Cleaning by combustion processes, e.g. using squibs, using travelling burners
P:0 F28G 13/00
Appliances or processes not covered by groups F28G 1/00-F28G 11/00; Combinations of appliances or processes covered by groups F28G 1/00-F28G 11/00
P:70 F28G 15/00
Details (measuring thickness of deposit G01B)