Top IPC subclasses
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1
|
H01L
|
35
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Semiconductor devices; electric solid state devices not otherwise provided for
|
|
2
|
G01R
|
7
|
Measuring electric variables; measuring magnetic variables
|
|
3
|
C01G
|
7
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Compounds containing metals not covered by subclasses C01D or C01F
|
|
4
|
C01B
|
6
|
non-metallic elementscompounds thereof
|
|
5
|
G01N
|
6
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Investigating or analysing materials by determining their chemical or physical properties
|
|
6
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G01J
|
6
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measurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics o
|
|
7
|
G01M
|
6
|
testing static or dynamic balance of machines or structurestesting structures or apparatus not other
|
|
8
|
A01G
|
4
|
Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
|
|
9
|
D21H
|
3
|
pulp compositionspreparation thereof not covered by subclasses , impregnating or coating of papertre
|
|
10
|
G01W
|
2
|
meteorology
|
|
11
|
F42B
|
2
|
explosive charges, e.g. for blastingfireworksammunition
|
|
12
|
H03B
|
2
|
generation of oscillations, directly or by frequency-changing, by circuits employing active elements
|
|
13
|
G01B
|
2
|
measuring length, thickness, or similar linear dimensionsmeasuring anglesmeasuring areasmeasuring ir
|
|
14
|
H01C
|
1
|
resistors
|
|
15
|
G06G
|
1
|
analogue computers
|
|
16
|
B82B
|
1
|
nano-structuresmanufacture or treatment thereof
|
|
17
|
B41M
|
1
|
printing, duplicating, marking, or copying processescolour printing
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|
18
|
C01D
|
1
|
compounds of alkali metals, i.e. lithium, sodium, potassium, rubidium, caesium, or francium
|
|
19
|
E01H
|
1
|
street cleaningcleaning of permanent wayscleaning beachescleaning landdispersing fog in general
|
|
20
|
C30B
|
1
|
single-crystal growthunidirectional solidification of eutectic material or unidirectional demixing o
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