US PATENT SUBCLASS 297 / 344.16
.~.~.~.~ Gas or hydraulic cylinder

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

311  DF  MOVABLE BOTTOM {5}
344.1  DF  .~ Bottom and back movable as a unit {3}
344.12  DF  .~.~ Vertically adjustable {4}
344.15  DF  .~.~.~ Pivotal linkage assembly {2}
344.16.~.~.~.~ Gas or hydraulic cylinder

DEFINITION

Classification: 297/344.16

Gas or hydraulic cylinder:

(under subclass 344.15) Device in which the vertical adjustment means includes an assembly having a piston slidable inside a cylinder, wherein the piston contacts gas or liquid within the cylinder.