US PATENT SUBCLASS 280 / FOR 163
.~.~.~.~ Vacuum controls spring strength (280/706)

Current as of: June, 1999
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280 /   HD   LAND VEHICLES

*  DD  WHEELED {1}
*  DD  .~ Running gear {6}
FOR 145  DF  .~.~ Suspension means (280/688) {8}
FOR 159  DF  .~.~.~ Fluid (280/702) {9}
FOR 163.~.~.~.~ Vacuum controls spring strength (280/706)

DEFINITION

Classification: 280/FOR.163

Foreign art collection for fluid suspension means wherein the amount of fluid pressure available within the fluid spring is controlled by the application of a vacuum or negative pressure. The vacuum source is usually, but not necessarily, the vehicle engine.