US PATENT SUBCLASS 73 / 303
.~.~.~ Suction type or vacuum tank action

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

290 R  DF  LIQUID LEVEL OR DEPTH GAUGE {13}
299  DF  .~ Hydrostatic pressure type {3}
302  DF  .~.~ With fluid displacement or replenishment {1}
303.~.~.~ Suction type or vacuum tank action

DEFINITION

Classification: 73/303

(under subclass 302) Gauges wherein the displacement or replenishing means produces a pressure less than atmospheric or the action of a vacuum type fuel feeding tank is employed. The suction may be employed to produce a pressure differential proportional to the head of liquid in the reservoir, or may cause directly or indirectly the entrainment of air to replenish the system.