US PATENT SUBCLASS 417 / 553
.~.~.~ Annular


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}
545  DF  .~ Valved piston {7}
552  DF  .~.~ Reciprocating {2}
553.~.~.~ Annular


DEFINITION

Classification: 417/553

(under subclass 552) Apparatus in which the valve comprises a ring like member.