US PATENT SUBCLASS 73 / 861.54
.~.~.~.~ Slotted piston or cylinder

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

861  DF  VOLUME OR RATE OF FLOW {23}
861.42  DF  .~ Using differential pressure {6}
861.52  DF  .~.~ With restriction {4}
861.53  DF  .~.~.~ Automatically variable restriction {3}
861.54.~.~.~.~ Slotted piston or cylinder

DEFINITION

Classification: 73/861.54

Slotted piston or cylinder:

(under subclass 861.53) Subject matter wherein the effective area of the restriction is varied by relative movement of an apertured or slotted piston or cylinder.