US PATENT SUBCLASS 359 / 678
.~.~ Prism lens type

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

642  DF  LENS {32}
676  DF  .~ With variable magnification (e.g., zoom type ) {6}
678.~.~ Prism lens type

DEFINITION

Classification: 359/678

Prism lens type:

(under subclass 676) Subject matter where the lens includes prisms disposed along the optical axis which are movable to vary the equivalent focal length of the lens.

(1) Note. See subclass 831 for the definition of a prism.

SEE OR SEARCH THIS CLASS, SUBCLASS:

669+, for lenses with prisms which are movable for varying the focal length in only one plane.