US PATENT SUBCLASS 359 / 677
.~.~ Optically compensated

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

642  DF  LENS {32}
676  DF  .~ With variable magnification (e.g., zoom type ) {6}
677.~.~ Optically compensated

DEFINITION

Classification: 359/677

Optically compensated:

(under subclass 676) Subject matter wherein the lens is physically linked and dependently moved to maintain an equivalent focal length.