US PATENT SUBCLASS 73 / 861.53
.~.~.~ Automatically variable restriction

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.~.~.~ Automatically variable restriction {3}
861.54  DF  .~.~.~.~> Slotted piston or cylinder
861.55  DF  .~.~.~.~> Cone and ball or disk {2}
861.58  DF  .~.~.~.~> Orifice and tapered plug

DEFINITION

Classification: 73/861.53

Automatically variable restriction:

(under subclass 861.52) Subject matter wherein the effective area of the restriction is automatically varied by the differential pressure created.

SEE OR SEARCH THIS CLASS, SUBCLASS:

861.71, wherein a restriction is varied by the thrust forces on an object and the object is biased by gravity or a spring.