US PATENT SUBCLASS 297 / 452.31
.~.~.~ Rigid or semirigid preshaped panel

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

452.1  DF  BOTTOM OR BACK {12}
452.29  DF  .~ Contoured back {3}
452.3  DF  .~.~ For lower back; i.e., lumbar region {2}
452.31.~.~.~ Rigid or semirigid preshaped panel

DEFINITION

Classification: 297/452.31

Rigid or semirigid preshaped panel:

(under subclass 452.3) Device wherein the contoured lower back support is made of a material that is substantially nonyielding or that yields to a slight degree.

SEE OR SEARCH THIS CLASS, SUBCLASS:

230.12, for a supplemental back which includes a rigid panel.