US PATENT SUBCLASS 297 / 308
.~.~ Back immovable relative to bottom

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

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
307  DF  .~ Constantly oriented during up-and-down movement {2}
308.~.~ Back immovable relative to bottom

DEFINITION

Classification: 297/308

(under subclass 307) Device wherein the back and the bottom move as a unit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

344.12+, for a bottom-and-back unit which is movable vertically, without any resilient support.

452.1+, for a static bottom-and-back unit, per se.