Top IPC subclasses
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1
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H01L
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7
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Semiconductor devices; electric solid state devices not otherwise provided for
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|
2
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G01N
|
2
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Investigating or analysing materials by determining their chemical or physical properties
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|
3
|
H01C
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1
|
resistors
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|
4
|
G01R
|
1
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Measuring electric variables; measuring magnetic variables
|
|
5
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C01G
|
1
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Compounds containing metals not covered by subclasses C01D or C01F
|
|
6
|
E01H
|
1
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street cleaningcleaning of permanent wayscleaning beachescleaning landdispersing fog in general
|
|
7
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H05K
|
1
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printed circuitscasings or constructional details of electric apparatusmanufacture of assemblages of
|
|
8
|
F25B
|
1
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refrigeration machines, plants, or systemscombined heating and refrigeration systemsheat pump system
|
|
9
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G01J
|
1
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measurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics o
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|
10
|
A01G
|
1
|
Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
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