US PATENT SUBCLASS 297 / 303.4
.~.~ Coil 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}
303.4.~.~ Coil spring {1}
303.5  DF  .~.~.~> Coaxial adjustment member extends through coil

DEFINITION

Classification: 297/303.4

Coil spring:

(under subclass 303.1) Elastic member where the resilient member is a tight helix, and whereby movement is countered by compression or expansion.