US PATENT SUBCLASS 160 / 221
.~.~.~ Doubly extensible by sliding only

Current as of: June, 1999
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160 /   HD   FLEXIBLE OR PORTABLE CLOSURE, PARTITION, OR PANEL

130  DF  PLURAL STRIP, SLAT, OR PANEL TYPE {11}
218  DF  .~ Movably interconnected {4}
220  DF  .~.~ Interconnected for plural relative motions {1}
221.~.~.~ Doubly extensible by sliding only

DEFINITION

Classification: 160/221

(under subclass 220) Devices in which the elements are slidably interconnected so that the area of the unit may be varied in more than one direction, such as both laterally and longitudinally, to increase or decrease the unit area.

SEE OR SEARCH THIS CLASS, SUBCLASS:

374+, for single frames having side bars so adjustable.