US PATENT SUBCLASS 417 / 290
.~ Having timer or delay means for fluid controller


Current as of: June, 1999
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417 /   HD   PUMPS

279  DF  WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
290.~ Having timer or delay means for fluid controller


DEFINITION

Classification: 417/290

(under subclass 279) Apparatus including means to cause or permit the fluid flow control means to operate or not to operate for a period of time after a change of condition has been sensed and then act to start, stop or change the mode of operation of the means.

(1) Note. Excluded from this definition is a dashpot or damper whose control fluid is independent of the pumped fluid and which dashpot or damper is in combination with valve means which controls the pumped fluid flow. Such combination is classified below on other features.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27, for condition responsive control of both the pump fluid and the pump drive motor with means for delaying operation of the pump fluid controlling valve.