US PATENT SUBCLASS 297 / 301.2
.~.~ 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}
301.1  DF  .~ Back adjusts independent of seat {4}
301.2.~.~ Fluid-spring

DEFINITION

Classification: 297/301.2

Fluid-spring:

(under subclass 301.1) Opposed back movement wherein the resilient member, by way of gas or liquid, resists the tilting of the back (i.e. hydraulic or pneumatic cylinder).