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
 F21
LIGHTING (electric aspects or elements, see section H, e.g. electric light sources H01J, H01K, H05B)
 F21

Note(s)

Attention is drawn to Note III of Section H, and in particular that subclass H05B covers electrical aspects of the same technical subjects that are covered by class F21.

 F21Y
INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21L, F21S and F21V, RELATING TO THE FORM OF THE LIGHT SOURCES  [7]
 F21Y

Note(s)

This subclass constitutes an indexing scheme associated with subclasses F21LF21S and F21V, relating to the form of the light sources. [7]

 F21Y 101/00
Point-like light sources  [7]
 F21Y 101/02
·  Miniature, e.g. light emitting diodes (LED)  [7]
 F21Y 103/00
Elongated light sources, e.g. fluorescent tubes  [7]
 F21Y 103/02
·  curved, e.g. ring-shaped  [7]
 F21Y 103/025
·  ·  U-shaped  [7]
 F21Y 105/00
Planar light sources  [7]
 F21Y 111/00
Light sources of form not covered by groups F21Y 101/00-F21Y 105/00  [7]
 F21Y 113/00
Combination of light sources  [7]
 F21Y 113/02
·  of different form  [7]