US PATENT SUBCLASS 359 / 711
.~.~ Toroidal

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}
711.~.~ Toroidal

DEFINITION

Classification: 359/711

Toroidal:

(under subclass 708) Subject matter wherein the nonspherical lens surface has a shape generated by the revolution of any closed plane curve about a nonintersecting axis lying in its plane.