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IPC Subclass
G01M

TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

Introduced: September 1968

Classification Context

Section:
PHYSICS
Class:
MEASURING; TESTING
Subclass:
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

Description

G01M covers apparatus and methods for evaluating the balance characteristics of rotating or stationary machines and structural systems, including vibration analysis, alignment measurement, and integrity assessment. This subclass encompasses balancing machines for rotors, wheels, and similar components, as well as testing equipment for detecting deviations from desired operational conditions. It includes structural load testing, durability assessment, and non-destructive examination methods applied to apparatus not specifically classified elsewhere in G01. Applications range from automotive and aerospace component verification to industrial machinery maintenance and safety validation.

Filing statistics

IPC subclass G01M recorded 339,843 patent applications worldwide between 2013 and 2023. Annual filings grew from 15,255 in 2013 to 47,565 in 2023 (+212%). The most active applicants in class G01 are SGCC(STATE GRID CORPORATION OF CHINA) (41,447 applications), CHINESE ACADEMY OF SCIENCES (32,952 applications) and ROBERT BOSCH (16,470 applications).

Source: EPO PATSTAT, worldwide filings

In class comparison

G01M ranks 5th of 18 subclasses with filings in G01, with 339,843 applications between 2013 and 2023, 7.2% of the class. Annual filings grew 212% from 2013 to 2023, above the class as a whole (+138%).

Top 10 of 18 subclasses of class G01 by patent applications, 2013–2023
RankSubclassTitleApplicationsShare
1G01N, Investigating or Analysing Materials by Determining Their Chemical or Physical PropertiesInvestigating or Analysing Materials by Determining Their Chemical or Physical Properties1,640,91834.9%
2G01R, Measuring Electric Variables; Measuring Magnetic VariablesMeasuring Electric Variables; Measuring Magnetic Variables598,08312.7%
3G01B, Measuring Length, Thickness or Similar Linear Dimensions; Measuring Angles; Measuring Areas; Measuring Irregularities of Surfaces or ContoursMeasuring Length, Thickness or Similar Linear Dimensions; Measuring Angles; Measuring Areas; Measuring Irregularities of Surfaces or Contours395,6628.4%
4G01S, 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 WavesRadio 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 Waves358,2147.6%
5G01MTesting Static or Dynamic Balance of Machines or Structures; Testing of Structures or Apparatus, Not Otherwise Provided for339,8437.2%
6G01C, Measuring Distances, Levels or Bearings; Surveying; Navigation; Gyroscopic Instruments; Photogrammetry or VideogrammetryMeasuring Distances, Levels or Bearings; Surveying; Navigation; Gyroscopic Instruments; Photogrammetry or Videogrammetry271,4745.8%
7G01D, 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 forMeasuring 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 for207,3954.4%
8G01F, Measuring Volume, Volume Flow, Mass Flow, or Liquid Level; Metering by VolumeMeasuring Volume, Volume Flow, Mass Flow, or Liquid Level; Metering by Volume157,0843.3%
9G01L, Measuring Force, Stress, Torque, Work, Mechanical Power, Mechanical Efficiency, or Fluid PressureMeasuring Force, Stress, Torque, Work, Mechanical Power, Mechanical Efficiency, or Fluid Pressure145,0693.1%
10G01K, Measuring Temperature; Measuring Quantity of Heat; Thermally-Sensitive Elements Not Otherwise Provided forMeasuring Temperature; Measuring Quantity of Heat; Thermally-Sensitive Elements Not Otherwise Provided for118,1082.5%

Source: EPO PATSTAT, worldwide filings

Additional Content

Calibrating means ascertaining the quality of a measuring or testing device, or checking, adjusting graduations of measuring or testing device Monitoring means maintain a continuous or periodical watch (human or instrumental) on, to enable action to be taken or initiated, or a signal to be given, if undesired conditions occur Investigating means testing or determining. Testing means determination of the presence, quality, or genuineness of object to be tested.

11 direct subcodes

Child Classifications

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  • G01M 10/00 Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
  • G01M 5/00 Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings
  • G01M 99/00 Subject matter not provided for in other groups of this subclass

Top Applicants

Top 10 applicants by patent filingsfor class G01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SGCC(STATE GRID CORPORATION OF CHINA) 41,447
  2. CHINESE ACADEMY OF SCIENCES 32,952
  3. ROBERT BOSCH DE 16,470
  4. SAMSUNG ELECTRONICS COMPANY KR 10,052
  5. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 9,573
  6. ZHEJIANG UNIVERSITY 9,529
  7. GUANGDONG POWER GRID CORPORATION 8,615
  8. TSINGHUA UNIVERSITY 7,805
  9. HALLIBURTON ENERGY SERVICES GROUP US 7,796
  10. QUALCOMM US 7,171