US PATENT SUBCLASS 251 / 54
.~.~ Closed fluid circuit dashpot or choke chamber


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
48  DF  .~ Dashpot or fluid controlled retarder or timer {5}
54.~.~ Closed fluid circuit dashpot or choke chamber


DEFINITION

Classification: 251/54

(under subclass 48) Subject matter in which valve operation is affected by an isolated fluid flowing from an expansible chamber into a storage space from which it returns to fill the expansible chamber without co-mingling with other fluids.

(1) Note. Frequently the isolated fluid is caused to flow from one side of a piston to the other.

(2) Note. See the search notes to subclass 48 for related fields of search.

SEE OR SEARCH THIS CLASS, SUBCLASS:

48+, and 55, for dashpot utilizing unconfined atmospheric air as the fluid drawn into the expansible chamber.