Top IPC subclasses
1
|
H02M
|
4
|
apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
|
2
|
G05F
|
2
|
systems for regulating electric or magnetic variables
|
3
|
G01R
|
2
|
Measuring electric variables; measuring magnetic variables
|
4
|
F02B
|
2
|
Internal-combustion piston engines; combustion engines in general
|
5
|
H01C
|
1
|
resistors
|
6
|
C01B
|
1
|
non-metallic elementscompounds thereof
|
7
|
H03M
|
1
|
coding, decoding or code conversion, in general
|
8
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
|
9
|
H02J
|
1
|
circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
|
10
|
C01F
|
1
|
compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium
|
11
|
G01K
|
1
|
measuring temperaturemeasuring quantity of heatthermally-sensitive elements not otherwise provided f
|