US PATENT SUBCLASS 297 / 303.2
.~.~ Fluid spring

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  DF  .~ Adjustable resistance {3}
303.2.~.~ Fluid spring

DEFINITION

Classification: 297/303.2

Fluid Spring:

(under subclass 303.1) Opposed back and bottom movement wherein the resilient member, by way of gas or liquid, resists the tilting (i.e. hydraulic or pneumatic cylinder).