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


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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.