DIFF Subgroup
A61B 3/02 Subjective types, i.e. testing apparatus requiring the active assistance of the patient
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Apparatus for testing the eyes; Instruments for examining the eyes > Subjective types, i.e. testing apparatus requiring the active assistance of the patient
CPC:
Apparatus for testing the eyes; Instruments for examining the eyes (eye inspection using ultrasonic, sonic or infrasonic waves A61B8/10) > Subjective types, i.e. testing apparatus requiring the active assistance of the patient
Of 6 combined children, 5 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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- A61B 3/024 for determining the visual field, e.g. perimeter types since 1990 IPC+CPC Available in IPC and CPC
- A61B 3/028 for testing visual acuity; for determination of refraction, e.g. phoropters since 1990 +1 CPC IPC+CPC Available in IPC and CPC
- A61B 3/06 for testing light sensitivity, e.g. adaptation; for testing colour vision +2 CPC IPC+CPC Available in IPC and CPC
- A61B 3/08 for testing binocular or stereoscopic vision, e.g. strabismus +1 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class A61,2013–2023, worldwide · Source: EPO PATSTAT
- PHILIPS ELECTRONICS NL 18,523
- NOVARTIS CH 14,253
- COVIDIEN US 13,953
- ROCHE CH 12,005
- CHINESE ACADEMY OF SCIENCES 11,955
- UNIVERSITY OF CALIFORNIA US 11,692
- HARVARD UNIVERSITY US 11,596
- L'OREAL FR 11,593
- P&G (PROCTER & GAMBLE COMPANY) US 11,297
- OLYMPUS CORPORATION JP 9,594
Top Applicants (CPC)
Class A61,2013–2023, worldwide · Source: EPO PATSTAT
- PHILIPS ELECTRONICS NL 20,621
- NOVARTIS CH 15,792
- ROCHE CH 14,303
- COVIDIEN US 13,862
- HARVARD UNIVERSITY US 13,454
- UNIVERSITY OF CALIFORNIA US 12,798
- P&G (PROCTER & GAMBLE COMPANY) US 12,140
- L'OREAL FR 11,800
- OLYMPUS CORPORATION JP 9,894
- BOSTON SCIENTIFIC SCIMED US 9,513