US PATENT SUBCLASS 359 / 640
.~.~ Including prismatic element

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

618  DF  SINGLE CHANNEL SIMULTANEOUSLY TO OR FROM PLURAL CHANNELS (E.G., LIGHT DIVIDING, COMBINING, OR PLURAL IMAGE FORMING, ETC.) {3}
639  DF  .~ By refraction at beam splitting or combining surface {1}
640.~.~ Including prismatic element

DEFINITION

Classification: 359/640

Including prismatic element:

(under subclass 639) Subject matter including a transparent optical element having at least two polished plane faces, inclined relative to each other, to cause refraction through the faces.

(1) Note. A prism is geometrically constructed of parallel bases or ends and congruent polygons and sides that are parallelograms in order to either (a) disperse light into a spectrum or (b) reflect rays of light.

SEE OR SEARCH THIS CLASS, SUBCLASS:

831+, for prisms generally.