US PATENT SUBCLASS 417 / 418
.~.~.~.~.~ Opposed pumping member faces (e.g., double acting)

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

321  DF  MOTOR DRIVEN {32}
410.1  DF  .~ Electric or magnetic motor {10}
415  DF  .~.~ Reciprocating rigid pumping member {2}
416  DF  .~.~.~ Reciprocating motor {1}
417  DF  .~.~.~.~ Unitary pump and motor working member {1}
418.~.~.~.~.~ Opposed pumping member faces (e.g., double acting)

DEFINITION

Classification: 417/418

(under subclass 417) Apparatus in which the rigid pumping member is provided with a pair of oppositely directed pumping faces, said pumping member cooperating with a single pump cylinder to divide same into a pair of opposed expansible pumping chambers or with plural pump cylinders to form plural plural expansible pumping chamber; reciprocation of said pumping member in one stroke direction serving to expand one pump chamber and simultaneously contract another