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PCE
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DIFF Subgroup
G01R 23/16

Spectrum analysis; Fourier analysis

Introduced: September 1968

Full Title

Arrangements for measuring frequencies; Arrangements for analysing frequency spectra > Spectrum analysis; Fourier analysis

IPC and CPC are identically structured here. All 8 subcodes exist in both systems.

Child Classifications

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  • G01R 23/163 adapted for measuring in circuits having distributed constants since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/17 with optical auxiliary devices since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/173 Wobbulating devices similar to swept panoramic receivers since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/175 by delay means, e.g. tapped delay lines since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/177 Analysis of very low frequencies since 1980 IPC+CPC Available in IPC and CPC
  • G01R 23/18 with provision for recording frequency spectrum IPC+CPC Available in IPC and CPC
  • G01R 23/20 Measurement of non-linear distortion IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

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