US PATENT SUBCLASS 297 / 307
.~ Constantly oriented during up-and-down movement

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.~ Constantly oriented during up-and-down movement {2}
308  DF  .~.~> Back immovable relative to bottom
309  DF  .~.~> Bottom component resiliently supports back

DEFINITION

Classification: 297/307

(under subclass 285) Device wherein the back is adjustable vertically and wherein the plane of the back in any position of adjustment is parallel to every position of adjustment.