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IPC Subgroup
G01N 27/9

using eddy currents

Introduced: January 1980

Last revised: January 2021

Full Title

Investigating or analysing materials by the use of electric, electrochemical, or magnetic means > by investigating magnetic variables > for investigating the presence of flaws > using eddy currents

Classification Context

Section:
PHYSICS
Class:
MEASURING; TESTING
Subclass:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

Filing statistics

IPC G01N 27/9 belongs to the parent subclass G01N, which recorded 1,640,918 patent applications worldwide between 2013 and 2023. Annual filings grew from 83,705 in 2013 to 199,434 in 2023 (+138%). 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

3 direct subcodes

Child Classifications

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  • G01N 27/9013 Arrangements for scanning
  • G01N 27/904 with two or more sensors
  • G01N 27/9093 Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting

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