US PATENT SUBCLASS 417 / 529
.~.~.~ Parallel laterally spaced relatively movable pistons

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}
521  DF  .~ Plural pumping chambers {7}
523  DF  .~.~ Including valved piston {5}
529.~.~.~ Parallel laterally spaced relatively movable pistons

DEFINITION

Classification: 417/529

(under subclass 523) Apparatus comprising two or more pistons which are capable of or constrained to move relative to each other, the longitudinal axis of one of said pistons being spaced from and parallel to the longitudinal axis of another of said pistons, said pistons being positioned in separate pumping chambers.