US PATENT SUBCLASS 417 / 453
.~.~.~ Threaded connecting elements

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
451  DF  .~ Valve element mounted in fixed chamber wall removable with pumping member {1}
452  DF  .~.~ By separable engageable connecting elements {1}
453.~.~.~ Threaded connecting elements

DEFINITION

Classification: 417/453

(under subclass 452) Apparatus in which the engageable portions are formed by interengaging helical screw threads.