Top IPC subclasses
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1
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G09B
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5
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educational or demonstration appliancesappliances for teaching, or communicating with, the blind, de
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2
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F24S
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4
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|
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3
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E04C
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2
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Structural elements; building materials
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4
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F24H
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2
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fluid heaters, e.g. water or air heaters, having heat-generating means, in general
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5
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G01N
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2
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Investigating or analysing materials by determining their chemical or physical properties
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6
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H02N
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1
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electric machines not otherwise provided for
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7
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F24J
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1
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Production or use of heat not otherwise provided for
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8
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G01R
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1
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Measuring electric variables; measuring magnetic variables
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9
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H01L
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1
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Semiconductor devices; electric solid state devices not otherwise provided for
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|
10
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H01F
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1
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magnetsinductancestransformersselection of materials for their magnetic properties
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|
11
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H01R
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1
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electrically-conductive connectionsstructural associations of a plurality of mutually-insulated elec
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|
12
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H01M
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1
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processes or means, e.g. batteries, for the direct conversion of chemical energy into electrical ene
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|
13
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H02J
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1
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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|
14
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B66F
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1
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hoisting, lifting, hauling, or pushing, not otherwise provided for, e.g. devices which apply a lifti
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|
15
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A01G
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1
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Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
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|
16
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H02S
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1
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