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CPC Main Group
G01R 29/00

Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00

11 direct subcodes

Child Classifications

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  • G01R 29/04 Measuring form factor, i.e. quotient of root-mean-square value and arithmetic mean of instantaneous value; Measuring peak factor, i.e. quotient of maximum value and root-mean-square value
  • G01R 29/06 Measuring depth of modulation
  • G01R 29/16 Measuring asymmetry of polyphase networks
  • G01R 29/18 Indicating phase sequence; Indicating synchronism
  • G01R 29/20 Measuring number of turns; Measuring transformation ratio or coupling factor of windings
  • G01R 29/22 Measuring piezoelectric properties
  • G01R 29/24 Arrangements for measuring quantities of charge
  • G01R 29/26 Measuring noise figure; Measuring signal-to-noise ratio

Top Applicants

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

  1. CHINESE ACADEMY OF SCIENCES 21,460
  2. ROBERT BOSCH DE 17,801
  3. SGCC(STATE GRID CORPORATION OF CHINA) 17,347
  4. SAMSUNG ELECTRONICS COMPANY KR 13,192
  5. QUALCOMM US 9,900
  6. HALLIBURTON ENERGY SERVICES GROUP US 9,742
  7. PHILIPS ELECTRONICS NL 7,249
  8. MITSUBISHI ELECTRIC CORPORATION JP 6,503
  9. ZHEJIANG UNIVERSITY 6,414
  10. DENSO CORPORATION JP 6,382