US PATENT SUBCLASS 359 / 664
.~ Spherical

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

642  DF  LENS {32}
664.~ Spherical

DEFINITION

Classification: 359/664

Spherical:

(under subclass 642) Subject matter wherein one of the lens elements has two convex refractive surfaces which are concentric and of equal curvature.