US PATENT SUBCLASS 297 / 452.49
.~.~ Including a support 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.~.~ Including a support spring {3}
452.5  DF  .~.~.~> Coil compression spring {1}
452.52  DF  .~.~.~> Noncoil wire spring (e.g., linear or sinuous wires, etc.) {1}
452.54  DF  .~.~.~> Spring integral with frame of bottom or back

DEFINITION

Classification: 297/452.49

Including a support spring:

(under subclass 452.48) Device wherein the cushioned bottom or back includes a resilient spring element.

SEE OR SEARCH CLASS

5, Beds,

230+, for a bed bottom comprising fabrics and spring; subclasses 246+ for a bed bottom comprising springs.

267, Spring Devices,

80+, for a spring panel and see (2) Note of subclass 80.