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PCE
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DIFF Subgroup
G01J 1/14

using comparison with a surface of graded brightness,

Introduced: September 1968

Title

Titles differ between systems:

IPC: using comparison with a surface of graded brightness

CPC: using comparison with a surface of graded brightness,

Full Title

Full titles differ between systems:

IPC:

Photometry, e.g. photographic exposure meter > by comparison with reference light or electric value > using wholly visual means > using comparison with a surface of graded brightness

CPC:

Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > by comparison with reference light or electric value > using wholly visual means (G01J1/20 takes precedence) > using comparison with a surface of graded brightness,

No child classifications to compare. This is a leaf node in both IPC and CPC.