|  | 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

|  | F24 |
HEATING; RANGES; VENTILATING (protecting plants by heating in gardens, orchards, or forests Fulltext... Hierarchy... Expanded...A01G 13/06; baking ovens and apparatus Fulltext... Hierarchy... Expanded...A21B; cooking devices other than ranges Fulltext... Hierarchy... Expanded...A47J; forging Fulltext... Hierarchy... Expanded...B21J, Fulltext... Hierarchy... Expanded...B21K; specially adapted for vehicles, see the relevant subclasses of classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B60-B64; combustion apparatus in general Fulltext... Hierarchy... Expanded...F23; drying Fulltext... Hierarchy... Expanded...F26B; ovens in general Fulltext... Hierarchy... Expanded...F27; electric heating elements or arrangements Fulltext... Hierarchy... Expanded...H05B)

|  | F24 |
Note(s) In this class, the following terms are used with the meanings indicated: "stove" includes apparatus which may have an open fire, e.g. fireplace; "range" means an apparatus for cooking having elements that perform different cooking operations or cooking and heating operations.

|  | F24J |
PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR (materials therefor Fulltext... Hierarchy... Expanded...C09K 5/00; engines or other mechanisms for producing mechanical power from heat, see the relevant classes, e.g. Fulltext... Hierarchy... Expanded...F03G for using natural heat)

|  | F24J |
Note(s) Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces of materials are further classified in subclass Fulltext... Hierarchy... Expanded...C12S. [5]

P:0 |  | F24J 1/00 |
Apparatus or devices using heat produced by exothermal chemical reactions other than by combustion (for cooking-vessels Fulltext... Hierarchy... Expanded...A47J 36/28; self-heating compresses Fulltext... Hierarchy... Expanded...A61F 7/03; materials for the production of heat or cold undergoing non-reversible chemical reactions, other than by combustion, when used Fulltext... Hierarchy... Expanded...C09K 5/18)

P:10 |  | F24J 2/00 |
Use of solar heat, e.g. solar heat collectors (distillation or evaporation of water using solar energy Fulltext... Hierarchy... Expanded...C02F 1/14; roof covering aspects of energy collecting devices Fulltext... Hierarchy... Expanded...E04D 13/18; devices for producing mechanical power from solar energy Fulltext... Hierarchy... Expanded...F03G 6/00; semi-conductor devices specially adapted for converting solar energy into electrical energy Fulltext... Hierarchy... Expanded...H01L 25/00, Fulltext... Hierarchy... Expanded...H01L 31/00; semiconductor devices including arrays of solar cells using heat energy Fulltext... Hierarchy... Expanded...H01L 31/058; generators in which light radiation is directly converted into electrical energy Fulltext... Hierarchy... Expanded...H02N 6/00) [4,5]

|  | F24J 2/02 |
· | Solar heat collectors with support for article heated, e.g. stoves, ranges, crucibles, furnaces or ovens using solar heat [4]

|  | F24J 2/04 |
· | Solar heat collectors having working fluid conveyed through collector [4]

|  | F24J 2/05 |
· · | surrounded by a transparent enclosure, e.g. evacuated solar collectors [6]

|  | F24J 2/06 |
· · | having concentrating elements (optical elements or systems per se Fulltext... Hierarchy... Expanded...G02B) [4]

|  | F24J 2/07 |
· · · | Receivers working at high temperature, e.g. for solar power plants [6]

|  | F24J 2/08 |
· · · | having lenses as concentrating elements [4]

|  | F24J 2/10 |
· · · | having reflectors as concentrating elements [4]

|  | F24J 2/12 |
· · · · | parabolic [4]

|  | F24J 2/13 |
· · · · | hemispherical [6]

|  | F24J 2/14 |
· · · · | semi-cylindrical or cylindro-parabolic [4]

|  | F24J 2/15 |
· · · · | conical [6]

|  | F24J 2/16 |
· · · · | having flat plates [4]

|  | F24J 2/18 |
· · · · | spaced, opposed interacting reflecting surfaces [4]

|  | F24J 2/20 |
· · | the working fluid being conveyed between plates [4]

|  | F24J 2/22 |
· · · | having extended surfaces, e.g. protrusions, corrugations (Fulltext... Hierarchy... Expanded...F24J 2/28 takes precedence) [4]

|  | F24J 2/23 |
· · | the working fluid trickling freely over collector elements [6]

|  | F24J 2/24 |
· · | the working fluid being conveyed through tubular heat absorbing conduits [4]

|  | F24J 2/26 |
· · · | having extended surfaces, e.g. protrusions (Fulltext... Hierarchy... Expanded...F24J 2/28 takes precedence) [4]

|  | F24J 2/28 |
· · | having permeable mass, foraminous or porous materials [4]

|  | F24J 2/30 |
· · | with means to exchange heat between plural fluids [4]

|  | F24J 2/32 |
· · | having evaporator and condenser section, e.g. heat pipe [4]

|  | F24J 2/34 |
· · | having heat storage mass [4]

|  | F24J 2/36 |
· | Rollable or foldable collector units [4]

|  | F24J 2/38 |
· | employing tracking means (Fulltext... Hierarchy... Expanded...F24J 2/02, Fulltext... Hierarchy... Expanded...F24J 2/06 take precedence; rotary supports or mountings therefor Fulltext... Hierarchy... Expanded...F24J 2/54; direction-finders for determining the direction from which electromagnetic waves are being received Fulltext... Hierarchy... Expanded...G01S 3/78; control of position or direction Fulltext... Hierarchy... Expanded...G05D 3/00) [4]

|  | F24J 2/40 |
· | Control arrangements [4]

|  | F24J 2/42 |
· | Solar heat systems not otherwise provided for [4]

|  | F24J 2/44 |
· · | having thermosiphonic circulation [4]

|  | F24J 2/46 |
· | Component parts, details or accessories of solar heat collectors [4]

|  | F24J 2/48 |
· · | characterised by the absorber material [4]

|  | F24J 2/50 |
· · | Transparent coverings [4]

|  | F24J 2/51 |
· · | Thermal insulation (Fulltext... Hierarchy... Expanded...F24J 2/50 takes precedence) [6]

|  | F24J 2/52 |
· · | Arrangement of mountings or supports [4]

|  | F24J 2/54 |
· · · | specially adapted for rotary movement [6]

P:20 |  | F24J 3/00 |
Other production or use of heat, not derived from combustion (use of solar heat Fulltext... Hierarchy... Expanded...F24J 2/00)

|  | F24J 3/06 |
· | using natural heat [4]

|  | F24J 3/08 |
· · | using geothermal heat (devices for producing mechanical power from geothermal energy Fulltext... Hierarchy... Expanded...F03G 4/00) [4,5]