US PATENT SUBCLASS 297 / 303.3
.~.~ Torsion bar or torsion spring

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


297 /   HD   CHAIRS AND SEATS

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
303.1  DF  .~ Adjustable resistance {3}
303.3.~.~ Torsion bar or torsion spring

DEFINITION

Classification: 297/303.3

Torsion bar or torsion spring:

(under subclass 303.1) Elastic member wherein the resilient member is a solid material considerably longer than it is wide, or is a corkscrew- type that twists to resist the tilting of the back.