US PATENT SUBCLASS 359 / 653
.~.~ Having an axial gradient

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

642  DF  LENS {32}
652  DF  .~ With graded refractive index {2}
653.~.~ Having an axial gradient

DEFINITION

Classification: 359/653

Having an axial gradient:

(under subclass 652) Subject matter wherein the index of refraction varies along an optical axis.