US PATENT SUBCLASS 137 / 169
.~.~ Gas pressure controlled by manual or cyclic means

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
156  DF  .~ Gas pressure discharge of liquids feed traps (e.g., to boiler) {3}
169.~.~ Gas pressure controlled by manual or cyclic means {1}
170  DF  .~.~.~> Movable trap chamber

DEFINITION

Classification: 137/169

(under subclass 156) Feed-traps wherein the gas pressure application to the feed-traps controlled by manual or cyclic means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

631+, for cyclic actuation of valves, and see the search notes to subclass 631.