IPC Classification

Class code (prefix) Descriptions Number of results
H01B Cablesconductorsinsulatorsselection of materials for their conductive, insulating or dielectric properties
H01C Resistors
H01F Magnetsinductancestransformersselection of materials for their magnetic properties
H01G Capacitorscapacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices of the electrolytic type
H01H Electric switchesrelaysselectorsemergency protective devices
H01J Electric discharge tubes or discharge lamps
H01K Electric incandescent lamps
H01L Semiconductor devices not covered by class
H01M Processes or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy
H01P Waveguidesresonators, lines or other devices of the waveguide type
H01Q Antennas, i.e. radio aerials
H01R Electrically-conductive connectionsstructural associations of a plurality of mutually-insulated electrical connecting elementscoupling devicescurrent collectors
H01S Devices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate lightdevices using stimulated emission of electromagnetic radiation in wave ranges other than optical
H01T Spark gapsovervoltage arresters using spark gapssparking plugscorona devicesgenerating ions to be introduced into non-enclosed gases
H02B Boards, substations or switching arrangements for the supply or distribution of electric power
H02G Installation of electric cables or lines, or of combined optical and electric cables or lines
H02H Emergency protective circuit arrangements
H02J Circuit arrangements or systems for supplying or distributing electric powersystems for storing electric energy
H02K Dynamo-electric machines
H02M Apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systemsconversion of dc or ac input power into surge output powercontrol or regulation thereof
H02N Electric machines not otherwise provided for
H02P Control or regulation of electric motors, electric generators or dynamo-electric converterscontrolling transformers, reactors or choke coils
H02S Generation of electric power by conversion of infrared radiation, visible light or ultraviolet light, e.g. using photovoltaic [pv] modules
H03B Generation of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching mannergeneration of noise by such circuits
H03C Modulation
H03D Demodulation or transference of modulation from one carrier to another
H03F Amplifiers
H03G Control of amplification
H03H Impedance networks, e.g. resonant circuitsresonators
H03J Tuning resonant circuitsselecting resonant circuits
H03K Pulse technique
H03L Automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses
H03M Coding, decoding or code conversion, in general
H04B Transmission
H04H Broadcast communication
H04J Multiplex communication
H04K Secret communicationjamming of communication
H04L Transmission of digital information, e.g. telegraphic communication
H04M Telephonic communication
H04N Pictorial communication, e.g. television
H04Q Selecting
H04R Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducersdeaf-aid setspublic address systems
H04S Stereophonic systems
H04W Wireless communication networks
H05B Electric heating electric light sources not otherwise provided forcircuit arrangements for electric light sources, in general
H05C Electric circuits or apparatus specially designed for use in equipment for killing, stunning, enclosing or guiding living beings
H05F Static electricitynaturally-occurring electricity
H05G X-ray technique
H05H Plasma technique production of accelerated electrically-charged particles or of neutronsproduction or acceleration of neutral molecular or atomic beams
H05K Printed circuitscasings or constructional details of electric apparatusmanufacture of assemblages of electrical components
H10B Electronic memory devices
H10D Inorganic electric semiconductor devices
H10F Inorganic semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
H10H Inorganic light-emitting semiconductor devices having potential barriers
H10K Organic electric solid-state devices
H10N Electric solid-state devices not otherwise provided for
H99Z Subject matter not otherwise provided for in this section