US PATENT SUBCLASS 297 / 452.22
.~.~ Planar bottom with a central recess

Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

452.1  DF  BOTTOM OR BACK {12}
452.21  DF  .~ Contoured bottom {2}
452.22.~.~ Planar bottom with a central recess

DEFINITION

Classification: 297/452.22

Planar bottom with a central recess:

(under subclass 452.21) Device in which the bottom comprises a substantially planar surface having a depression or indentation located substantially at a center of the bottom.