US PATENT SUBCLASS 297 / 303.1
.~ Adjustable resistance

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

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
303.1.~ Adjustable resistance {3}
303.2  DF  .~.~> Fluid spring
303.3  DF  .~.~> Torsion bar or torsion spring
303.4  DF  .~.~> Coil spring {1}

DEFINITION

Classification: 297/303.1

Adjustable resistance:

(under subclass 285) Elastic member in which the apparatus can be modified to vary displacement.

SEE OR SEARCH CLASS

267, Spring Devices, appropriate subclasses for adjustable springs, per se.