US PATENT SUBCLASS 160 / 374.1
.~.~.~ Expandable at corner joint (e.g., artists's canvas stretcher frame)

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

371  DF  FRAMED TYPE {6}
372  DF  .~ Adjustable frame size {3}
374  DF  .~.~ Double extensible {1}
374.1.~.~.~ Expandable at corner joint (e.g., artists's canvas stretcher frame)

DEFINITION

Classification: 160/374.1

(under subclass 374) Device wherein the size adjustment of the device is accomplished by means associated with one or more joints of the frame to force the adjacent members apart.