Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filedfiledCritical
Application grantedgrantedCritical
Publication of FR789105ApublicationCriticalpatent/FR789105A/fr
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
Landscapes
Physics & Mathematics
(AREA)
Spectroscopy & Molecular Physics
(AREA)
Health & Medical Sciences
(AREA)
Life Sciences & Earth Sciences
(AREA)
Chemical & Material Sciences
(AREA)
Analytical Chemistry
(AREA)
Biochemistry
(AREA)
General Health & Medical Sciences
(AREA)
General Physics & Mathematics
(AREA)
Immunology
(AREA)
Pathology
(AREA)
FR789105D1934-07-251934-07-25Procédés et appareils pour déterminer l'intensité de coloration d'un liquide
ExpiredFR789105A
(fr)