US PATENT SUBCLASS 359 / 654
.~.~ Having a radial 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}
654.~.~ Having a radial gradient {1}
655  DF  .~.~.~> In a variable media (e.g., gas, elastomer, etc.)

DEFINITION

Classification: 359/654

Having a radial gradient:

(under subclass 652) Subject matter wherein the index of refraction varies in a direction at a right angle to an optical axis.