US PATENT SUBCLASS 359 / 728
.~.~.~ With aspheric surface (e.g., Schmidt lens, etc.)

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

642  DF  LENS {32}
726  DF  .~ With reflecting element {3}
727  DF  .~.~ Including concave or convex reflecting surface {2}
728.~.~.~ With aspheric surface (e.g., Schmidt lens, etc.) {1}
729  DF  .~.~.~.~> With concave and convex reflectors in series

DEFINITION

Classification: 359/728

With aspheric surface (e.g., Schmidt lens, etc.):

(under subclass 727) Subject matter in which one of the refracting or reflecting surfaces departs from the spherical shape (e.g., a Schmidt type lens).

SEE OR SEARCH THIS CLASS, SUBCLASS:

364+, for catadioptric lenses combined with an ocular or viewing system.

708+, for other aspheric-type lens.