G01J 9/00 Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
CPC: Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)
Full Title
Full titles differ between systems:
Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)
CPC subdivides this area 3x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
Note: 3 CPC extensions are marked as secondary classification only.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G01J 9/02 by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B9/02) since 1980 +16 CPC IPC+CPC Available in IPC and CPC
- G01J 9/04 by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained since 1980 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class G01,2013–2023, worldwide · Source: EPO PATSTAT
- SGCC(STATE GRID CORPORATION OF CHINA) 41,447
- CHINESE ACADEMY OF SCIENCES 32,952
- ROBERT BOSCH DE 16,470
- SAMSUNG ELECTRONICS COMPANY KR 10,052
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 9,573
- ZHEJIANG UNIVERSITY 9,529
- GUANGDONG POWER GRID CORPORATION 8,615
- TSINGHUA UNIVERSITY 7,805
- HALLIBURTON ENERGY SERVICES GROUP US 7,796
- QUALCOMM US 7,171
Top Applicants (CPC)
Class G01,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 21,460
- ROBERT BOSCH DE 17,801
- SGCC(STATE GRID CORPORATION OF CHINA) 17,347
- SAMSUNG ELECTRONICS COMPANY KR 13,192
- QUALCOMM US 9,900
- HALLIBURTON ENERGY SERVICES GROUP US 9,742
- PHILIPS ELECTRONICS NL 7,249
- MITSUBISHI ELECTRIC CORPORATION JP 6,503
- ZHEJIANG UNIVERSITY 6,414
- DENSO CORPORATION JP 6,382