IPC Classification

Class code (prefix) Descriptions Number of results
G01B Measuring length, thickness or similar linear dimensions; measuring angles; measuring areas; measuring irregularities of surfaces or contours
G01C Measuring distances, levels or bearings; surveying; navigation; gyroscopic instruments; photogrammetry or videogrammetry
G01D Measuring not specially adapted for a specific variable; arrangements for measuring two or more variables not covered by a single other subclass; tariff metering apparatus; transferring or transducing arrangements not specially adapted for a specific variable; measuring or testing not otherwise provided for
G01F Measuring volume, volume flow, mass flow, or liquid level; metering by volume
G01G Weighing
G01H Measurement of mechanical vibrations or ultrasonic, sonic or infrasonic waves
G01J Measurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infra-red, visible or ultra-violet light; colorimetry; radiation pyrometry
G01K Measuring temperature; measuring quantity of heat; thermally-sensitive elements not otherwise provided for
G01L Measuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure
G01M Testing static or dynamic balance of machines or structures; testing of structures or apparatus, not otherwise provided for
G01N Investigating or analysing materials by determining their chemical or physical properties
G01P Measuring linear or angular speed, acceleration, deceleration or shock; indicating presence or absence of movement;  indicating direction of movement 
G01Q Scanning-probe techniques or apparatus; applications of scanning-probe techniques, e.g. scanning-probe microscopy [spm]
G01R Measuring electric variables; measuring magnetic variables
G01S Radio direction-finding; radio navigation; determining distance or velocity by use of radio waves; locating or presence-detecting by use of the reflection or reradiation of radio waves; analogous arrangements using other waves
G01T Measurement of nuclear or x-radiation
G01V Geophysics; gravitational measurements; detecting masses or objects; tags
G01W Meteorology
G02B Optical elements, systems, or apparatus
G02C Spectacles; sunglasses or goggles insofar as they have the same features as spectacles; contact lenses
G02F Devices or arrangements, the optical operation of which is modified by changing the optical properties of the medium of the devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light, e.g. switching, g; techniques or procedures for the operation thereof; frequency-changing; non-linear optics; optical logic elements; optical analogue/digital converters
G03B Apparatus or arrangements for taking photographs or for projecting or viewing them; apparatus or arrangements employing analogous techniques using waves other than optical waves; accessories therefor
G03C Photosensitive materials for photographic purposes; photographic processes, e.g. cine, x-ray, colour or stereo-photographic processes; auxiliary processes in photography
G03D Apparatus for processing exposed photographic materials; accessories therefor
G03F Photomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices; materials therefor; originals therefor; apparatus specially adapted therefor
G03G Electrography; electrophotography; magnetography
G03H Holographic processes or apparatus
G04B Mechanically-driven clocks or watches; mechanical parts of clocks or watches in general; time-pieces using the position of the sun, moon, or stars
G04C Electromechanical clocks or watches
G04D Apparatus or tools specially designed for making or maintaining clocks or watches
G04F Time-interval measuring
G04G Electronic time-pieces
G04R Radio-controlled time-pieces
G05B Control or regulating systems in general; functional elements of such systems; monitoring or testing arrangements for such systems or elements
G05D Systems for controlling or regulating non-electric variables
G05F Systems for regulating electric or magnetic variables
G05G Control devices or systems insofar as characterised by mechanical features only
G06C Digital computers in which all the computation is effected mechanically
G06D Digital fluid-pressure computing devices
G06E Optical computing devices
G06F Electric digital data processing
G06G Analogue computers
G06J Hybrid computing arrangements
G06K Recognition of data; presentation of data; record carriers; handling record carriers
G06M Counting mechanisms; counting of objects not otherwise provided for
G06N Computer systems based on specific computational models
G06Q Data processing systems or methods, specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes; systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes, not otherwise provided for
G06T Image data processing or generation, in general
G07B Ticket-issuing apparatus; taximeters; arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points;  franking apparatus
G07C Time or attendance registers; registering or indicating the working of machines; generating random numbers; voting or lottery apparatus; arrangements, systems or apparatus for checking not provided for elsewhere
G07D Handling of coins or of valuable papers, e.g. testing, sorting by denominations, counting, dispensing, changing or depositing
G07F Coin-freed or like apparatus
G07G Registering the receipt of cash, valuables, or tokens
G08B Signalling or calling systems; order telegraphs; alarm systems
G08C Transmission systems for measured values, control or similar signals
G08G Traffic control systems
G09B Educational or demonstration appliances; appliances for teaching, or communicating with, the blind, deaf or mute; models; planetaria; globes; maps; diagrams
G09C Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy
G09D Railway or like time or fare tables; perpetual calendars
G09F Displaying; advertising; signs; labels or name-plates; seals
G09G Arrangements or circuits for control of indicating devices using static means to present variable information
G10B Organs, harmoniums or similar wind musical instruments with associated blowing apparatus
G10C Pianos, harpsichords, spinets or similar stringed musical instruments with one or more keyboards
G10D Stringed musical instruments; wind musical instruments; accordions or concertinas; percussion musical instruments; aeolian harps; singing-flame musical instruments; musical instruments not otherwise provided for
G10F Automatic musical instruments
G10G Aids for music; supports for musical instruments; other auxiliary devices or accessories for music or musical instruments
G10H Electrophonic musical instruments; instruments in which the tones are generated by electromechanical means or electronic generators, or in which the tones are synthesised from a data store
G10K Sound-producing devices;  methods or devices for protecting against, or for damping, noise or other acoustic waves in general; acoustics not otherwise provided for
G10L Speech analysis or synthesis; speech recognition; speech or voice processing; speech or audio coding or decoding
G11B Information storage based on relative movement between record carrier and transducer
G11C Static stores
G12B Constructional details of instruments, or comparable details of other apparatus, not otherwise provided for
G16B Bioinformatics, i.e. information and communication technology [ict] specially adapted for genetic or protein-related data processing in computational molecular biology
G16C Computational chemistry; chemoinformatics; computational materials science
G16H Healthcare informatics, i.e. information and communication technology [ict] specially adapted for the handling or processing of medical or healthcare data
G16Y Information and communication technology specially adapted for the internet of things [iot]
G16Z Information and communication technology [ict] specially adapted for specific application fields, not otherwise provided for
G21B Fusion reactors
G21C Nuclear reactors
G21D Nuclear power plant
G21F Protection against x-radiation, gamma radiation, corpuscular radiation or particle bombardment; treating radioactively contaminated material; decontamination arrangements therefor
G21G Conversion of chemical elements; radioactive sources
G21H Obtaining energy from radioactive sources; applications of radiation from radioactive sources, not otherwise provided for; utilising cosmic radiation
G21J Nuclear explosives; applications thereof
G21K Techniques for handling particles or ionising radiation not otherwise provided for; irradiation devices; gamma ray or x-ray microscopes
G99Z Subject matter not otherwise provided for in this section