US PATENT SUBCLASS 359 / 457
.~.~.~.~ With Fresnel lens

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

443  DF  PROJECTION SCREEN {13}
454  DF  .~ Unitary sheet comprising plural refracting areas {1}
455  DF  .~.~ Lenticular {2}
456  DF  .~.~.~ Rear projection screen {1}
457.~.~.~.~ With Fresnel lens

DEFINITION

Classification: 359/457

With Fresnel lens:

(under subclass 456) Subject matter wherein the lenticulated rear projection screen includes a Fresnel lens or a lens resembling a plano-convex or plano-concave lens that is cut into narrow rings and flattened out.

(1) Note. See subclass 742 for the definition of Fresnel type lens.