US PATENT SUBCLASS 356 / 225
.~.~ With predetector light modifier (e.g., diaphragm)


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

213  DF  PHOTOMETERS {9}
218  DF  .~ Photoelectric {9}
225.~.~ With predetector light modifier (e.g., diaphragm)


DEFINITION

Classification: 356/225

(under subclass 218) Subject matter including an optical element such as a lens, shutter, diaphragm, or mirror in the light path to the light responsive device to modify the light coming to the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

221, for photoelectric type detectors with optical structure rendering the detectors responsive to incident or back lighting.

224, for multi-range photometers whose sensitivity is controlled by an adjustable optical element in the detector light path.

233, for visual type photometers with variable light apertures.

432+, for testing the light transmission properties of materials.

SEE OR SEARCH CLASS 250, Radiant Energy,

216+, for photocells with pre-photocell optical elements.

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

483+, for light polarization devices, subclasses 558+ for light diffraction elements, subclass 615 for light dispersion elements, subclasses 642+ for lenses, subclasses 227+ for light control by opaque elements movable in a light path, subclass 831 for prisms, subclasses 838+ for light reflectors, subclasses 885+ for light filters, and subclasses 894+ for optical apertures and tubes.

385, Optical Waveguides, appropriate subclasses for fiber optics, per se.