US PATENT SUBCLASS 297 / 452.52
.~.~.~ Noncoil wire spring (e.g., linear or sinuous wires, etc.)

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}
452.52.~.~.~ Noncoil wire spring (e.g., linear or sinuous wires, etc.) {1}
452.53  DF  .~.~.~.~> Encapsulated by cushion

DEFINITION

Classification: 297/452.52

Noncoil wire spring (e.g., linear or sinuous wires, etc.):

(under subclass 452.49) Device in which the spring element is made of metal that has been drawn into a very long thin thread or rod that is usually circular in cross section, and wherein the spring element is in the form of a straight or meandering tension or torque-type wire.