US PATENT SUBCLASS 396 / 563
SENSITOMETRY
Current as of: June, 1999
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DEFINITION
Classification: 396/563
SENSITOMETRY:
(under the class definition) Subject matter relating to the determination of the sensitivity of photos:graphic material to light.
(1) Note. Sensitometers test the sensitivity of photos:graphic material to light whereas actinometers or
exposure meters test light intensity and densitometers test the light transmission characteristics of material.
(2) Note. This subclass also provides for the making of optical wedges of varying light transmission characteristics involving the controlled exposure of photosensitive material to light for use in subsequent sensitometric apparatus.
SEE OR SEARCH CLASS
355, Photocopying,
38, 68, and 83 for combinations including photocells or light-monitoring means.
356, Optics: Measuring and Testing, 213+, for light exposure meters, per se, and subclasses 443+ for means which measure film density by light transmission or absorption. See (3) Note under subclass 443 for classification of methods which involve the comparison of optical densities of the type found in subclasses 443+ in combination with an exposure of a visible light sensitive film.
359, Optics: Systems (Including Communication) and Elements,
885+, for light filters, per se, and the classes recited thereat, under (1) Note.
