US PATENT SUBCLASS 297 / 452.65
.~ Rigid or semirigid hollow shell

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

452.1  DF  BOTTOM OR BACK {12}
452.65.~ Rigid or semirigid hollow shell

DEFINITION

Classification: 297/452.65

Rigid or semirigid hollow shell:

(under subclass 452.1) Device wherein the bottom or back includes two separated layers made of material that is substantially nonyielding or that yields to a slight degree, wherein the layers are spaced from one another to form an internal space therebetween.