US PATENT SUBCLASS 162 / 340
.~.~.~.~.~ Air cushion at above atmospheric pressure

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

232  DF  APPARATUS {22}
289  DF  .~ Running or indefinite length product forming and/or treating means {19}
315  DF  .~.~ Means directing stock into contact with molding surface {7}
336  DF  .~.~.~ Flow box, slice, and/or approach flow {6}
339  DF  .~.~.~.~ Closed to atmosphere {1}
340.~.~.~.~.~ Air cushion at above atmospheric pressure

DEFINITION

Classification: 162/340

(under subclass 339) Apparatus in which a gas under pressure higher than atmospheric pressure is maintained over the slurry supply within the head box usually to the velocity of the issuing slurry supply.