G01N 21/75 Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated (systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
CPC: Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated (systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73)
Full Title
Full titles differ between systems:
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light > Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence) > Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated (systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73)
CPC subdivides this area 4x more granularly than IPC with 6 additional codes.
6 codes are CPC-only extensions.
Note: 6 CPC extensions are marked as secondary classification only.
IPC defines codes here since 1980.
Child Classifications
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- G01N 21/77 by observing the effect on a chemical indicator since 1980 +7 CPC IPC+CPC Available in IPC and CPC