Interferometers

Introduced: September 1968

Full Title

Measuring instruments characterised by the use of optical techniques > Interferometers

Additional Content IPC

Apparatus for testing the eyes; Instruments for examining the eyes Fabry-Perot interferometers Interferometric spectrometry Using interferometric methods to measure optical phase difference, determine degree of coherence or measure optical wavelength Investigating or analysing materials using interferometric methods involving refractivity or phase-affecting properties Interference filters Devices for the control of the intensity, phase, polarisation or colour, by interference Depth or shape recovery in image analysis from laser ranging, e.g. using interferometry

Of 12 combined children, 6 exist in both systems.

6 codes are CPC-only extensions.

IPC defines codes here since 1974.

Child Classifications

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G01B 9/02001 characterised by controlling or generating intrinsic radiation properties since 2022 +4 CPC IPC+CPC Available in IPC and CPC
G01B 9/02015 characterised by the beam path configuration since 2022 +8 CPC IPC+CPC Available in IPC and CPC
G01B 9/02034 +2 CPC CPC only CPC only
G01B 9/02041 +6 CPC CPC only CPC only
G01B 9/02049 +4 CPC CPC only CPC only
G01B 9/02055 Reduction or prevention of errors; Testing; Calibration since 2022 +3 CPC IPC+CPC Available in IPC and CPC
G01B 9/02083 +5 CPC CPC only CPC only
G01B 9/0209 Low-coherence interferometers since 2022 IPC+CPC Available in IPC and CPC
G01B 9/02092 CPC only CPC only
G01B 9/02094 +2 CPC CPC only CPC only
G01B 9/02097 Self-interferometers since 2022 IPC+CPC Available in IPC and CPC
G01B 9/021 using holographic techniques since 1974 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