US PATENT SUBCLASS 396 / 500
.~.~.~.~ Symmetrical opening

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


396 /   HD   PHOTOGRAPHY

439  DF  CAMERA DETAIL {15}
452  DF  .~ Shutter {12}
493  DF  .~.~ Pivoting or rotating blade type {3}
497  DF  .~.~.~ Plural oscillating blades {4}
500.~.~.~.~ Symmetrical opening

DEFINITION

Classification: 396/500

Symmetrical opening:

(under subclass 497) Subject matter wherein the blades move

in diverse directions from or toward a center and form an aperture which always varies the same from the center.

SEE OR SEARCH THIS CLASS, SUBCLASS:

, FOR 904, for a foreign art collection involving a shutter having plural oscillating blades forming a symmetrical opening.