US PATENT SUBCLASS 356 / 416
.~ With color transmitting filter

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

402  DF  BY SHADE OR COLOR {10}
416.~ With color transmitting filter {4}
417  DF  .~.~> Included with sample excitation
418  DF  .~.~> Including rotating sequential filters
419  DF  .~.~> Including multicolor filters
420  DF  .~.~> Included with colored light sources

DEFINITION

Classification: 356/416

With color transmitting filter:

(under subclass 402) Subject matter wherein a light filter having a particular light transmission characteristic to pass light of a particular color is disposed in the light path of the testing device.

(1) Note. The filter may be in the light path between the sample and the light source or between the sample and the viewing position path.

(2) Note. Included are visual devices of the extinction type, and of the equal intensity comparison type involving colored light, per se, or involving colored light reflected from or transmitted through a substance.

(3) Note. Comparison types utilizing colored light standards are placed here rather than in subclass 190.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43+, for optical pyrometers which may utilize colored light filters to determine the temperature of a light emissive source.

213, for photometers which measure the intensity of light without regard to the frequencies of light present in the light tested.

300+, for spectroscopes, spectrometers, and spectrophotometers which utilize a dispersing element such as a prism or a diffraction grating rather than a filter to separate collimated light into bands of the various colors present in the light.

414+, for color-transmitting filters used in the examination of color transmission by fluids.

SEE OR SEARCH CLASS

250, Radiant Energy,

226, for prephotocell optical systems which may utilize a visible colored light filter in the system where no indicator is claimed or disclosed and no support for object tested is included in the claims.

359, Optics: Systems (Including Communication) and Elements,

885+, for filters, per se.