US PATENT SUBCLASS 297 / 301.4
.~.~ 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}
301.1  DF  .~ Back adjusts independent of seat {4}
301.4.~.~ Coil spring

DEFINITION

Classification: 297/301.4

Coil spring:

(under subclass 300.1) Opposed back movement where the resilient member is helical, and whereby movement is countered by compression or expansion.