US PATENT SUBCLASS 297 / 302.4
.~.~ 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}
302.1  DF  .~ Back and bottom adjust in a fixed relationship {4}
302.4.~.~ Coil spring

DEFINITION

Classification: 297/302.4

Coil spring:

(under subclass 302.1) Opposed back and bottom movement where the resilient member is helical, and whereby movement is countered by compression or expansion.