US PATENT SUBCLASS 359 / 709
.~.~ Conical

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

642  DF  LENS {32}
708  DF  .~ Including a nonspherical surface {10}
709.~.~ Conical

DEFINITION

Classification: 359/709

Conical:

(under subclass 708) Subject matter wherein the nonspherical

surface has a shape bounded by a closed planar base and the surface formed by connecting line segments between every point on the perimeter of this base with a common point.