US PATENT SUBCLASS 297 / 452.5
.~.~.~ Coil compression spring

Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

452.1  DF  BOTTOM OR BACK {12}
452.48  DF  .~ Cushioned {3}
452.49  DF  .~.~ Including a support spring {3}
452.5.~.~.~ Coil compression spring {1}
452.51  DF  .~.~.~.~> Encapsulated by cushion

DEFINITION

Classification: 297/452.5

Coil compression spring:

(under subclass 452.49) Device in which the resilient spring element is in the form of a compressible wire having at least two revolutions which extend upwardly in a vertical direction to exert a bias force to a seating surface of the bottom or back.