US PATENT SUBCLASS 297 / 452.51
.~.~.~.~ Encapsulated by cushion

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  DF  .~.~.~ Coil compression spring {1}
452.51.~.~.~.~ Encapsulated by cushion

DEFINITION

Classification: 297/452.51

Encapsulated by cushion:

(under subclass 452.5) Device in which the coil compression spring element is embedded inside the cushioning material.